YOU SAID:

my dog ate the cat, but the cat ate the mouse, but the mouse ate the cheese.

INTO JAPANESE

私の犬は猫を食べたが、猫はネズミを食べたが、ネズミはチーズを食んだ。

BACK INTO ENGLISH

My dog ate cats, cats ate rats, but rats ate cheese.

INTO JAPANESE

私の犬は猫を食べ、猫はネズミを食べましたが、ネズミはチーズを食べました。

BACK INTO ENGLISH

My dog ate cats, cats ate rats, but rats ate cheese.