YOU SAID:
fish die so do people
INTO JAPANESE
魚は死ぬので人々も死ぬ
BACK INTO ENGLISH
Because fish die, so do people
INTO JAPANESE
魚が死ぬので人も死ぬ
BACK INTO ENGLISH
Because the fish die, so do the people
INTO JAPANESE
魚が死ぬので人々も死ぬ
BACK INTO ENGLISH
People die because fish die
INTO JAPANESE
魚が死ぬので人は死ぬ
BACK INTO ENGLISH
People die because fish die
That didn't even make that much sense in English.