I went jogging along a river near my apartment as usual this duskin the evening as usual.

I likenjoyed stopping to see their harvest.

One of them, an old man, had just caught a crab.

He needehad to lift the strlinge, remove the strlinge from the crab's leg, and hold the crab at the same time.

He quickly arranged the fishing string, thenand I left after throwing the crab into his harvest bucket.

What do you mean by "arranged"?

As usual, I went jogging along athe river near my apartment as usual thisthis evening at dusk.

I liked stopping to see their harvest.

But as you know, he only had two hands, so it was a little bit of a struggle for him to do it.

He quickly arranged the fishing string, then I left after throwingand I threw the crab into his harvest bucket.

This dusk, I went jogging along a river near my apartment as usual this dusk.

The sentence is a bit more fluid with the time stated at the front.

I went jogging along a river near my apartment as usual this evening around dusk.

We don’t have the expression “this dawn” or “this dusk.”

I liked stopping to see their harvestcatch.

“See their catch” sounds like you looked in their buckets to see what they caught. Is this what you mean? Or maybe you mean “watch them land their catch” (watch them catch something)?

One of them, an old man, had just caught a crab.

He needed to lifthold up the strlinge, remove the stringline (hook?) from the crab's leg (claw?), and hold the crab at the same time.

A string, cord, filament, etc. used for fishing is called a “(fishing) line.”

Was there a hook on the end of the line? If so, we’d usually say “remove the hook.”

“From the crab’s leg” sounds like the line was wrapped or tied around its leg. If the crab was holding it in its claw, say “from its claw.”

But as you know, he only had two hands, so it was a lbittle of a struggle for him to do it.

He quickly arranged the fishing string,line, and then I left after throwing the crab into his harvest bucket.

“Bucket” is more natural than “harvest bucket.”

Suggestion: After he took care of the line, I tossed the crab in his bucket and jogged on.

I went jogging along a river near my apartment, as usual this, at dusk.

"this dusk" is present tense but "I went" is past tense.

He quickly arrangremoved the fishing string, and then I left after throwing the crab into his harvest bucket.

Arranged means to place the string in a specific way. I think "remove" is what you meant.

Also, this is two sentences, so adding "and" between will join the sentences.

I went jogging along a river near my apartment as usual this duskevening.

You could also say "as usual at dusk [this evening]"

I liked stopping to see their harvestcatch.

In English, we call a fisherman's "harvest" his "catch" (because you "catch" fish).

One of them, an old man, had just caught a crab.

I think adding "had" makes this sentence sound more natural.

He needed to lift the string, remove the string from the crab's leg, and hold the crab at the same time.

I don't know enough about fishing to say if this is correct or not. It sounds okay though.

But as you know, he only hads two hands, so it was a lbittle of a struggle for him to do it.

I think "a bit of a struggle" sounds more natural than "a little struggle."

He quickly arranged the fishing string, then I left after throwing the crab into his harvest bucket.

This sentence sounds a little unnatural, but it makes sense! However in English I don't know if we have an equivalent term for his "harvest bucket." However, I have never heard it referred to as that.

I went jogging along a river near my apartment as usual this evening around dusk.

I liked stopping to see their harvcatchest.