YOU SAID:

an horse riding a horse riding my cat so i kill the fisherman

INTO JAPANESE

私の猫に乗っている馬に乗っている馬だから、私は漁師を殺す

BACK INTO ENGLISH

I kill a fisherman because he's a horse on my cat's horse

INTO JAPANESE

猫の馬に乗った馬だから漁師を殺す

BACK INTO ENGLISH

It's a horse on a cat horse, so I'm gonna kill the fisherman.

INTO JAPANESE

猫の馬に乗った馬だから漁師を殺す

BACK INTO ENGLISH

It's a horse on a cat horse, so I'm gonna kill the fisherman.