Complex sentence: Charles Grymes McCawley (January 29,1827--October 13,1891) was the eighth Commandant of the Marine Corps and served as an officer in the United States Marine Corps during the Mexican-American War and the American Civil War.
Split into simpler sentences: Charles Grymes McCawley (January 29,1827--October 13,1891) was the eighth Commandant of the Marine Corps. McCawley served as an officer in the United States Marine Corps during the Mexican-American War and the American Civil War.