Complex sentence: He commanded the 51st New York Volunteers at Cedar Mountain, Second Bull Run and Antietam, was wounded at Antietam and at Petersburg, was commissioned major-general of volunteers in September 1865, and was mustered out in 1866.
Split into simpler sentences: He commanded the 51st New York Volunteers at Cedar Mountain, Second Bull Run and Antietam. He was wounded at Antietam and at Petersburg, was commissioned major-general of volunteers in September 1865, and was mustered out in 1866.