Complex sentence: Hearnes served in the U.S. Army during World War II and was a member of Missouri state house of representatives between 1950 and 1961; he was the Secretary of State of Missouri between 1961 and 1965.
Split into simpler sentences: Hearnes served in the army during World War II and was a member of Missouri state house of representatives between 1950 and 1961. He served as the Secretary of State of Missouri between 1961 and 1965.