YOU SAID:

when the pineapples fell, the world started to decay

INTO JAPANESE

パイナップルが落ちると世界は腐敗し始めた

BACK INTO ENGLISH

The world began to rot when the pineapple fell

INTO JAPANESE

パイナップルが落ちたとき、世界は腐り始めた

BACK INTO ENGLISH

The world began to rot when the pineapple fell