YOU SAID:

there was a rich man was eating out of my wife.

INTO JAPANESE

私の妻から食べていた金持ちの男があった。

BACK INTO ENGLISH

The man was eating from my wife.

INTO JAPANESE

男は、私の妻から食べていた。

BACK INTO ENGLISH

He ate from my wife.

INTO JAPANESE

彼は私の妻から食べた。

BACK INTO ENGLISH

He ate from my wife.