YOU SAID:
They floated on the raft to sun their white backs
INTO JAPANESE
彼らは白い背中に日光浴をするためにいかだに浮かんだ
BACK INTO ENGLISH
They floated on a raft to sunbathe on their white backs
INTO JAPANESE
彼らは白い背中に日光浴をするためにいかだに浮かんだ
BACK INTO ENGLISH
They floated on a raft to sunbathe on their white backs
That didn't even make that much sense in English.