Simplify the following text for a Grade 9 native English-speaking person.
Original: After obtaining a commitment from Robinson to `` turn the other cheek '' to racial antagonism , Rickey agreed to sign him to a contract for $ 600 a month , equal to $ today .
Simplified: After receiving a vow from Robinson to `` turn the other cheek '' to racial taunts , Rickey agreed to sign him to a contract for $ 600 a month .