Complex sentence: William Childs Westmoreland (March 26,1914--July 18,2005) was a retired United States Army four-star general, who commanded U.S. military operations in the Vietnam War at its peak (1964--68), including during the 1968 Tet Offensive.
Split into simpler sentences: William Childs Westmoreland (March 26,1914--July 18,2005) was a retired United States Army four-star general. General Westmoreland was in command of all U.S. military operations in the Vietnam War from 1964 to 1968, including during the 1968 Tet Offensive.