Complex sentence: A native of Northfield, Minnesota, Rolvaag lived in his home town and graduated from St. Olaf College before fighting in World War II, where he rose to the rank of lieutenant and commanded a tank.
Split into simpler sentences: A native of Northfield, Minnesota, Rolvaag lived in his home town and graduated from St. Olaf College. He then fought in World War II, rising to the rank of lieutenant and commanding a tank.