YOU SAID:

They'll sell you the rope by which you'll hang yourself

INTO JAPANESE

彼らはあなたが首を吊るすためのロープをあなたに売るでしょう

BACK INTO ENGLISH

they will sell you a rope to hang yourself

INTO JAPANESE

彼らはあなたに首を吊るすためのロープを売るでしょう

BACK INTO ENGLISH

they will sell you a rope to hang yourself