Complex sentence: White enrolled in the New Mexico Military Institute in Roswell but was subsequently recommended to the U.S. Naval Academy in Annapolis, Maryland, by then U.S. Senator John L. McClellan of Arkansas.
Split into simpler sentences: White enrolled in the New Mexico Military Institute in Roswell. He was subsequently recommended to the U.S. Naval Academy in Annapolis, Maryland, by then U.S. Senator John L. McClellan of Arkansas.