YOU SAID:

cat was driving a car and he realized that he is a fat cat and then he comitted suicide

INTO JAPANESE

猫が車を運転していて、太った猫だと気づき、自殺した

BACK INTO ENGLISH

I killed myself when I noticed that a cat was driving a car and that it was a fat cat.

INTO JAPANESE

猫が車を運転していて太った猫だと気づいたとき、私は自殺した。

BACK INTO ENGLISH

I killed myself when I realized that a cat was driving a car and that it was a fat cat.

INTO JAPANESE

猫が車を運転していて太った猫だと気づいたとき、私は自殺しました。

BACK INTO ENGLISH

I killed myself when I realized that a cat was driving a car and that it was a fat cat.