Complex sentence: Competition has not only been limited to the west, but the Jacks have also taken on eastern programs such as the Ole Miss Rebels, Florida Atlantic Owls, and the Appalachian State Mountaineers.
Split into simpler sentences: Competition has not only been limited to the west. The Lumberjacks have also taken on eastern programs such as the Ole Miss Rebels, Florida Atlantic Owls, and the Appalachian State Mountaineers.