YOU SAID:

In his left half of his brain he has nothing right, and on his right half he has nothing left

INTO JAPANESE

彼の脳の左半分には正しいものがなく、右半分には何も残っていない

BACK INTO ENGLISH

The left half of his brain has nothing right and the right half has nothing left

INTO JAPANESE

彼の脳の左半分には正しいものがなく、右半分には何も残っていない

BACK INTO ENGLISH

The left half of his brain has nothing right and the right half has nothing left