YOU SAID:

I ate an apple from the store and it was red.

INTO JAPANESE

店でりんごを食べたら赤くなりました。

BACK INTO ENGLISH

When I ate an apple at the store, it turned red.

INTO JAPANESE

りんごを店で食べたら赤くなった。

BACK INTO ENGLISH

When I ate an apple at the store, it turned red.