YOU SAID:

I had had a cat but then he had disappeared.

INTO JAPANESE

猫を持っていたが、その後、彼は消えていた。

BACK INTO ENGLISH

I had a cat, but then he disappeared.

INTO JAPANESE

猫を持っていたが、その後彼は消えてしまった。

BACK INTO ENGLISH

Had a cat, but then he disappeared.

INTO JAPANESE

猫を持っていたが、彼が姿を消した。

BACK INTO ENGLISH

Having a cat, he disappeared.

INTO JAPANESE

猫を持っていること、彼は消えた。

BACK INTO ENGLISH

You have a cat, he disappeared.

INTO JAPANESE

猫、彼は消えた。

BACK INTO ENGLISH

Cats, he disappeared.

INTO JAPANESE

猫、彼は姿を消した。

BACK INTO ENGLISH

Cats, he disappeared.