Complex sentence: Callton earned a biology degree from Michigan State University in 1981; going on to serve in the U.S. Army from 1982 to 1985.After serving his country, he went on to earn a Doctorate of Chiropractic Medicine from the National University of Health Sciences in 1989.
Split into simpler sentences: Callton earned a biology degree from Michigan State University in 1981; going on to serve in the U.S. Army from 1982 to 1985. After leaving the army, he went on to earn a Doctorate of Chiropractic Medicine from the National University of Health Sciences in 1989.