Complex sentence: Harry Ervin Yarnell (18 October 1875-7 July 1959),-born near Independence, Iowa, 18 October 1875, began his naval career which spanned 51 years and 3 wars, when he entered the U.S. Naval Academy in 1893.
Split into simpler sentences: Harry Ervin Yarnell (18 October 1875-7 July 1959) was an American naval officer whose career spanned 51 years and 3 wars. Born near Independence, Iowa, he entered the U.S. Naval Academy in 1893.