The hardest past was to organized them in the truck, it was so hot in there.

If I hadHad I known it was going to be that hot, I would have wear shorts and sleeveless shirt.

It's an optional suggestion. Using inversion makes it sligthly more formal.

In spite of the delays, we really finishend fast, and we had a good time.

After helping with the moving, Wwe bought pizza because we were starving.

My husband and I woke up early, had breakfast and left the house ,this morning, so we are ready to help them out.

If I had known it was going to be that hot, I would have wearorn shorts and a sleeveless shirt.

In spite of the delays, we really finishend fast, and we had a good time.

Even though everyone was sweating in largely amount.

We have talked to our friends to organise helping them move to their new apartment today (Saturday).

My husband and I woke up early, had breakfast and left the house this morning, ready to help them out.

Excellent!

When we arrived, we started taking the big boxes first, and placinged them into the truck.

"Placed" sounds a bit more natural to me here

The hardest past was to organizedsing them in the truck, it was so hot in there.

Or "organizing" for US English

If I had known it was going to be that hot, I would have wearorn shorts and a sleeveless shirt.

However, we did everything pretty fast, but we got delayed, because of the fact the truck was not big enough.

In spite of the delays, we finished really end fast, and we had a good time.

Even though everyone was sweating in largely amouna lot.

After helping with the moving, Wwe bought pizza because we were starving.

All that time we did noWe hadn't eaten anything all day, just drank water for 5 hours.

Grammar and making the sentence a bit clearer

Journal Aabout mMy Day

We have talked to our friends to help them move to their new apartment today Saturday.

My husband and I woke up early, had breakfast, and left the house this morning, ready to help them out.

When we arrived, we started taking the big boxes first and placing them into the truck.

Alt: When we arrived, we started by first taking the big boxes and then placing them into the truck.

The hardest past was to organized them in the truck,; it was so hot in there.

Separate two complete sentences with a period or semicolon here.

If I had known that it was going to be that hot, I would have wearorn shorts and a sleeveless shirt.

However, we did everything pretty fast, but we got delayed, because of the fact the truck was not big enoughtruck's small size.

Changed for brevity.

In spite of the delays, we really end fast, and we had a good timefinished up quickly.

EWe had a good time, even though everyone was sweating in largely amouna lot.

By itself, it is an incomplete sentence, so I combined the previous sentence with this one.

After helping with the movinge, Wwe bought pizza because we were starving.

All that time that we were helping our friends, we did not eat anything, and just drank water for 5 hours.

We have talked to our friendOur friends asked us to help them move to their new apartment today, Saturday.

My husband and I woke up early, had breakfast, and left the house this morning, readywent to help them out.

When we arrived, we started by taking the big boxes first, and placing them into the truck.

The hardest past was to organizeding them in the truck,; it was so hot in there.

If I had known it was going to be that hot, I would have wearorn shorts and a sleeveless shirt.

However, we did everything pretty fast, but we got delayed, because of the fact the truckWe loaded the truck up pretty fast, but it was non't big enough.

Your version seems to contradict itself, based on the next sentence I guessed at your meaning.

So we drove the same route twice, back and forthhad to make two trips.

In spite of the delays, it didn't take long. Even though we were ally end fast, a sweaty by the end, we had a good time.

Even though everyone was sweating in largely amount.n/a

This is not a complete sentence. I connected this sentence to the earlier one.

AWe were starving after helping with them moving, We, so we bought a pizza because we were starving.

All that time we did noWe hadn't eaten anything, just drank water for 5 hours all day, for over 5 hours, we'd only drank water.

Journal Aabout mMy Day

Spelling rules for titles https://grammar.yourdictionary.com/capitalization/rules-for-capitalization-in-titles.html

We haved talked to our friends abouto helping them move to their new apartment today Saturon Saturday, which was today.

When we arrived, we started by taking the big boxes first and placing them into the truck.

The hardest past was to organizedsing them in the truck,; it was so hot in there.

; for two sentences that could be separated by a full stop

If I had known it was going to be that hot, I would have wearorn shorts and a sleeveless shirt.

However, we did everything pretty fast, buteven though we got delayed, because of the fact the truck was not big enough.

However indicates an opposition in what you said before (about it being hot)
But then you oppose that with "but"
So it sounds like you're saying it was fine that it was hot because you did everything quickly BUT actually, you didn't do everything fast
I'm not sure if that makes sense but there's too many oppositions in a row that it sounds a bit funny

In spite of the delays, we finished really end fast, and (we) had a good time, even though everyone was sweating buckets.

An informal way to say "sweat profusely" (<-- or you can use this one)

Even though everyone was sweating in largely amount.

I put it with the last sentence

After helping (out) with the moving, Wwe bought pizza because we were starving.

All thatThroughout that whole time, we did not eat anything, justonly drainking water for 5 hours.

A Journal AEntry about my Day

We have talked to our friends toand helped them move to their new apartment today Saturday.

When we arrived, we started taking the big boxes first and placing them into the truck.

The hardest past was to organizeding them in the truck, it was so hot in there.

If I had known it was going to be that hot, I would have wearorn shorts and a sleeveless shirt.

However, we did everything pretty fast, but we got delayed, because of the factworked pretty fast. But ran into a problem because the truck was not big enough.

In spite of the delays, we really end fastfinished really quickly, and we had a good time.

Even though everyone was sweating in largely amounta lot/ton.

After helping with the movinge, Wwe bought pizza because we were starving.

All that timeFor those five hours we did non't eat anything, we just drank water for 5 hours.

My husband and I woke up early, had breakfast and leaveft the house this morning, ready to help them out.

Past tense

The hardest pasrt wereas to organized them in the truck, i. It was so hot.

These read better to me as two sentences.

If I had known it was going to be that hot, I would wearhave worn shorts and sleeveless shirt.

Past conditional tense (to match "If I had known")

However, wWe did everything pretty fast, but we got delayed, because of the fact that the truck was not big enough.

"...of the fact that..." is kind of a set phrase. You could also say:
"...we got delayed because the truck was not big enough."

In spite of the delays, we ended really end fast, and we had a good time even though everyone was sweating a large amount.

I combined the next sentence with this one.

Even though everyone was sweating in largely amount.

After helping with the movinge, Wwe bought pizza because we were starving.

All that time we did not eat anything, we just drank water for 5 hours.