Complex sentence: Air Mobility Command (AMC) is a major command (MAJCOM) of the U.S. Air Force; one of ten major commands (MAJCOMs), reporting to Headquarters, United States Air Force (HQ USAF).
Split into simpler sentences: Air Mobility Command (AMC) is a major command (MAJCOM) of the United States Air Force. AMC is one of ten major commands (MAJCOMs), reporting to Headquarters, United States Air Force (HQ USAF).