Complex sentence: During the Civil War, Markham enlisted as a private in Company G, 32nd Wisconsin Volunteer Infantry Regiment; he was promoted to second lieutenant and after the war returned to Wisconsin and settled in Milwaukee.
Split into simpler sentences: During the Civil War, Markham enlisted as a private in Company G, 32nd Wisconsin Volunteer Infantry Regiment; he was promoted to second lieutenant. He was discharged After the war returned to Wisconsin and settled in Milwaukee.