Atlanta also acquires two future second-round picks in the deal.
Williams, one of the NBA's top bench scoring threats, has had a down season by his standards, averaging 12.1 points per game. This will be his second stint with the Hawks after spending two seasons in Atlanta earlier in his career.
Rondo has seen limited minutes for the young Hawks in 2020-21, averaging 3.9 points and 3.5 assists. He gives the Clippers a less reliable scorer but a more potent defender in the backcourt.