At the dDentist At the Dentist

After working from home, I kickstarted, an old motorbike that my "suegra" borrowed me. After working from home, I kickstarted an old motorbike that my "suegra" borrowed me.

After working from home, I kickstarted, an old motorbike that my "suegra" borrowedlent me. After working from home, I kickstarted an old motorbike that my "suegra" lent me.

After working from home, I kickstarted, an old motorbike that my "suegra" borrowedlent me. After working from home, I kickstarted an old motorbike that my "suegra" lent me.

After working from home, I kickstarted, an old motorbike that my "suegra"mother-in-law let me borrowed me. After working from home, I kickstarted an old motorbike that my mother-in-law let me borrow.

you could also say "that my mother-in-law lent me"

I Wwent to pick up a relative that was at the dentist. I went to pick up a relative that was at the dentist.

I Wwent to pick up a relative that was at the dentist. I went to pick up a relative that was at the dentist.

I Wwent to pick up a relative that was at the dentist. I went to pick up a relative that was at the dentist.

I usually say "who" instead of "that" if I am talking about a person or (sometimes) other animal

tThe doctor needed to apply anesthesia to the patient, since my relative is very sensitive to pain due to bad experiences with dentists in the past, atin the end, everything went smooth. So right now, I'm more aware of my dental hygiene. The doctor needed to apply anesthesia to the patient, since my relative is very sensitive to pain due to bad experiences with dentists in the past, in the end, everything went smooth. So right now, I'm more aware of my dental hygiene.

tThe doctor needed to apply anesthesia to the patient, since my relative is very sensitive to pain due to bad experiences with dentists in the past, at. In the end, everything went smooth.ly. So right now, I'm more aware of my dental hygiene. The doctor needed to apply anesthesia to the patient, since my relative is very sensitive to pain due to bad experiences with dentists in the past. In the end, everything went smoothly. So right now, I'm more aware of my dental hygiene.

tThe doctor needed to apply anesthesia to the patient, since my relative is very sensitive to pain due to bad experiences with dentists in the past, at. But in the end, everything went smooth.ly. So right now, I'm more aware of my dental hygiene. The doctor needed to apply anesthesia to the patient, since my relative is very sensitive to pain due to bad experiences with dentists in the past. But in the end, everything went smoothly. So right now, I'm more aware of my dental hygiene.

Very good, just be aware of punctuation and capital letters. (There is always a space after . , ? ! : ; )

tThe doctor needed to apply anesthesia to the patient, since my relativhim/her, since he/she is very sensitive to pain due to bad experiences with dentists in the past,; at the end, everything went smooth. So right now, I'm more aware of my dental hygiene. The doctor needed to apply anesthesia to him/her, since he/she is very sensitive to pain due to bad experiences with dentists in the past; at the end, everything went smooth. So right now, I'm more aware of my dental hygiene.

because you already said "my relative," it is unnecessary to say it again in the next sentence. Instead the pronouns that match their gender would be used.