YOU SAID:
Shrek is why the world turns
INTO JAPANESE
シュレックは世界が変わる理由です
BACK INTO ENGLISH
Shrek is the reason why the world is changing.
INTO JAPANESE
シュレックは世界が変わりつつある理由です。
BACK INTO ENGLISH
Shrek is the reason why the world is changing.
That didn't even make that much sense in English.