YOU SAID:

The banana ate the tuna melt sandwich which the witch of which it belonged to killed it for

INTO JAPANESE

バナナは、魔女に殺されたツナメルトサンドイッチを食べました

BACK INTO ENGLISH

Banana ate a tuna melt sandwich that was killed by a witch

INTO JAPANESE

バナナは魔女に殺されたツナメルトサンドイッチを食べた

BACK INTO ENGLISH

Banana ate a tuna melt sandwich that was killed by a witch