Complex sentence: The United States Air Force's 163d Combat Communications Group communications unit, headquartered in Sacramento, California, is one of eight Air National Guard Combat Communications Groups nationwide, which make up 80% of the U.S. Air Force tactical communications capability.
Split into simpler sentences: The United States Air Force's 163d Combat Communications Group communications unit. The 163d Combat Communications Group, Headquartered in Sacramento CA, is one of eight Air National Guard Combat Communications Groups nationwide, which make up 80% of the U.S. Air Force tactical communications capability.