Complex sentence: Holt returned to Oklahoma full-time in 2004 and served as Oklahoma's coordinator to re-elect Bush in 2004, and then served U.S. Senator Jim Inhofe and Lt. Governor Mary Fallin.
Split into simpler sentences: Holt returned to Oklahoma full-time in 2004 and served as Oklahoma's coordinator to re-elect Bush in 2004. Holt served U.S. Senator Jim Inhofe and Lt. Governor Mary Fallin.