YOU SAID:

The school had been exploded, killed hundreds in process.

INTO JAPANESE

学校は爆発し、数百人が死亡した。

BACK INTO ENGLISH

The school exploded, which killed hundreds of people.

INTO JAPANESE

学校は爆発し、何百人もの人々が死亡した。

BACK INTO ENGLISH

The school exploded, killed hundreds of people.

INTO JAPANESE

学校は爆発し、何百人もの人々が死亡した。

BACK INTO ENGLISH

The school exploded, killed hundreds of people.