YOU SAID:

There once was an apple, it was red.

INTO JAPANESE

かつてリンゴがあった、それは赤だった。

BACK INTO ENGLISH

Once had the Apple and it was red.

INTO JAPANESE

かつてはAppleがいて、それは赤でした。

BACK INTO ENGLISH

Once Apple was in, it was red.

INTO JAPANESE

Appleが入ってからは赤でした。

BACK INTO ENGLISH

It was red after Apple entered.

INTO JAPANESE

Appleが入った後は赤でした。

BACK INTO ENGLISH

It was red after Apple entered.