YOU SAID:

He went back to the back party because he likes the backs of backbones

INTO JAPANESE

彼はバックボーンのバックが好きだからバックパーティーに戻った

BACK INTO ENGLISH

He went back to the back party because he likes backbone back

INTO JAPANESE

彼はバックボーンバックが好きだからバックパーティーに戻った

BACK INTO ENGLISH

He went back to the back party because he likes backbone back