YOU SAID:

My mom went to the store and never came back.

INTO JAPANESE

母は店に行ったが二度と戻ってこなかった。

BACK INTO ENGLISH

My mother went to the store, but never came back.

INTO JAPANESE

母は店に行ったが、二度と戻ってこなかった。

BACK INTO ENGLISH

My mother went to the store, but never came back.