YOU SAID:

i was walking my fish then a snake fell from the sky while a plane was swimming

INTO JAPANESE

私が魚の散歩をしていたら、飛行機が泳いでいるときに空からヘビが落ちてきた

BACK INTO ENGLISH

I was taking a fish walk and a snake fell from the sky while the plane was swimming.

INTO JAPANESE

魚の散歩をしていたら、飛行機が泳いでいるときに空からヘビが落ちてきました。

BACK INTO ENGLISH

When I was taking a fish walk, a snake fell from the sky while the plane was swimming.

INTO JAPANESE

魚の散歩をしていると、飛行機が泳いでいるときに空からヘビが落ちてきました。

BACK INTO ENGLISH

While taking a fish walk, a snake fell from the sky while the plane was swimming.

INTO JAPANESE

魚の散歩をしていたところ、飛行機が泳いでいたところ、空からヘビが落ちてきました。

BACK INTO ENGLISH

I was taking a walk for fish, and while the plane was swimming, a snake fell from the sky.

INTO JAPANESE

魚を求めて散歩していたら、飛行機が泳いでいるときに空からヘビが落ちてきた。

BACK INTO ENGLISH

When I was taking a walk in search of fish, a snake fell from the sky while the plane was swimming.

INTO JAPANESE

魚を探して散歩していたら、飛行機が泳いでいたところ、空からヘビが落ちてきました。

BACK INTO ENGLISH

When I was taking a walk looking for fish, a snake fell from the sky while the plane was swimming.

INTO JAPANESE

魚を探して散歩していたら、飛行機が泳いでいたところ、空からヘビが落ちてきました。

BACK INTO ENGLISH

When I was taking a walk looking for fish, a snake fell from the sky while the plane was swimming.