Complex sentence: The Fifteenth Expeditionary Mobility Task Force (15 EMTF) was one of two EMTFs assigned to the United States Air Force Air Mobility Command (AMC) and was headquartered at Travis Air Force Base, California.
Split into simpler sentences: The Fifteenth Expeditionary Mobility Task Force (15 EMTF) was one of two EMTFs assigned to the United States Air Force Air Mobility Command (AMC). It was headquartered at Travis Air Force Base, California.