Complex sentence: Keith Owen "Moose" Munyan (September 6,1932-July 8,1996) became the head football coach at Mangham High School in 1963 and held the position for twenty-seven years.
Split into simpler sentences: Keith Owen "Moose" Munyan (September 6,1932-July 8,1996) became the head football coach at Mangham High School in 1963. He held the position for twenty-seven years.