YOU SAID:
Came back from hospital due to heart attack
INTO JAPANESE
病院から、心臓発作に戻ってきました
BACK INTO ENGLISH
From the hospital, I came back to the heart attack
INTO JAPANESE
病院から、私は心臓発作に戻ってきました
BACK INTO ENGLISH
From the hospital, I came back to the heart attack
That didn't even make that much sense in English.