Complex sentence: Mahershala Ali was cast as Boggs, Coin's right hand man, while Wes Chatham portrays Castor and Elden Henson plays his brother, Pollux, who is an avox, someone who had their tongue cut off by the Capitol.
Split into simpler sentences: Mahershala Ali was cast as Boggs, Coin's right hand man. While Wes Chatham portrays Castor and Elden Henson plays his brother, Pollux who is an avox, someone who had their tongue cut off by the Capitol.