YOU SAID:

I once ate but then I fell from a donkey

INTO JAPANESE

私はかつて食べたが、私はロバから落ちた

BACK INTO ENGLISH

I once ate, but I fell off the ass

INTO JAPANESE

私はかつて食べたが、私はお尻から落ちた

BACK INTO ENGLISH

I used to eat, but I fell off my ass

INTO JAPANESE

私は食べていましたが、私はお尻から落ちました

BACK INTO ENGLISH

I was eating but I fell off my butt

INTO JAPANESE

私は食べていたが、私は私のお尻から落ちた

BACK INTO ENGLISH

I was eating but I fell off my ass

INTO JAPANESE

私は食べていたが、私は私のお尻から落ちた

BACK INTO ENGLISH

I was eating but I fell off my ass