Complex sentence: Kelly did not coach the team in the loss to the Florida Gators because of his departure to Notre Dame despite previously telling his players he would stay to coach them in the biggest game in U.C. history.
Split into simpler sentences: Kelly did not coach the team in the loss to the Florida Gators because of his departure to Notre Dame. Going back on his word after telling his players he would stay to coach them in the biggest game in U.C. history.