YOU SAID:

My grandmother woke up in a coffin, on the underground

INTO JAPANESE

私の祖母は地下鉄で、棺の中で目を覚ました

BACK INTO ENGLISH

My grandmother was on the subway and woke up in the coffin

INTO JAPANESE

私の祖母は、地下鉄に乗った、棺の中で目が覚めた

BACK INTO ENGLISH

My grandmother woke up in the coffin rode the subway,

INTO JAPANESE

私の祖母で目を覚ました棺乗った地下鉄、

BACK INTO ENGLISH

Tube coffin woke up by my grandmother rode

INTO JAPANESE

私の祖母の乗ったによって目が覚めたチューブ棺

BACK INTO ENGLISH

Tube coffin woke up by my grandmother rode