Complex sentence: Jerry Moore left UNT for Texas Tech where he coached for a few years before starting a long and very successful run at Appalachian State, where he led that school to become the first FCS school to win 3 straight FCS national titles.
Split into simpler sentences: Jerry Moore left UNT for Texas Tech, where he coached for a few years before starting a long and very successful run at Appalachian State. He led that school to become the first FCS school to win 3 straight FCS national titles.