Complex sentence: From 1967 to 1973, McDaniel taught the U.S. Army how to train its infantrymen for instinct shooting with the service rifle in jungle or urban warfare; and the Army employed his training course for some years under the program name, "Quick Kill;".
Split into simpler sentences: From 1967 to 1973, McDaniel was an instructor for the U.S. Army, where he instructed infantrymen instinct shooting with the service rifle in jungle or urban warfare. The Army employed his training course for some years under the program name, "Quick Kill;".