YOU SAID:

I was at the store the other day and then some guy grabbed my melons I was going to buy out of my hands

INTO JAPANESE

私は先日店にいたし、何人かの男は私が私の手から買うつもりだった私のメロンをつかんだ

BACK INTO ENGLISH

I was in the store the other day and some guy grabbed my melon I was going to buy from my hand

INTO JAPANESE

私は先日店にいて、何人かの男が私の手から買うつもりだった私のメロンをつかんだ

BACK INTO ENGLISH

I was in the store the other day and grabbed my melon that some guy was going to buy from my hand

INTO JAPANESE

私は先日店にいて、何人かの男が私の手から買うつもりだった私のメロンをつかんだ

BACK INTO ENGLISH

I was in the store the other day and grabbed my melon that some guy was going to buy from my hand