Complex sentence: Shula has been with the Panthers since 2011, when he was hired as their quarterbacks coach, and was promoted to offensive coordinator after Rob Chudzinski was hired to be the head coach of the Cleveland Browns.
Split into simpler sentences: Shula has been with the Panthers since 2011, when he was hired as their quarterbacks coach. He was promoted to offensive coordinator after Rob Chudzinski was hired to be the head coach of the Cleveland Browns.