Complex sentence: Morris served in various garrison positions until 1836, when he was promoted to captain, 4th Artillery and fought the in the Second Seminole War including the Battle of Wahoo Swamp, receiving a brevet major appointment for gallant conduct.
Split into simpler sentences: Morris served in various garrison positions until 1836, when he was promoted to captain, 4th Artillery. He fought the in the Second Seminole War, including the Battle of Wahoo Swamp, receiving a brevet major appointment for gallant conduct.