YOU SAID:

there he goes, he stole that mans watch from his back pocket, grab his legs

INTO JAPANESE

そこに行くと、彼は男の後ろのポケットから時計を盗み、足をつかみました

BACK INTO ENGLISH

When he went there, he stole the watch from the man's back pocket and grabbed his leg.

INTO JAPANESE

彼がそこに行ったとき、彼は男の後ろのポケットから時計を盗み、彼の足をつかんだ。

BACK INTO ENGLISH

When he went there, he stole the watch from the man's back pocket and grabbed his leg.