Complex sentence: Okobi entered training camp as the starting center, but was replaced by Sean Mahan-move many feel was political, due to the coaching change from Bill Cowher to Mike Tomlin, and Tomlin's prior relationship with Mahan from his time with the Tampa Bay Buccaneers.
Split into simpler sentences: Okobi entered training camp as the starting center, but was replaced by Sean Mahan. A move many feel was political, due to the coaching change from Bill Cowher to Mike Tomlin, and Tomlin's prior relationship with Mahan from his time with the Tampa Bay Buccaneers.