YOU SAID:

don't tell the left hand what the right hand is doing

INTO JAPANESE

右手が何をしているのか左手に言わないでください

BACK INTO ENGLISH

Don't tell your left hand what your right hand is doing

INTO JAPANESE

右手が何をしているのかを左手に言わないでください

BACK INTO ENGLISH

Don't tell your left hand what your right hand is doing