Complex sentence: He was in private practice in Oklahoma City, Oklahoma, from 1977 to -1992 and from 1993 to 1996, also serving as an adjunct instructor at the University of Central Oklahoma from 1980 to 1981 and from 1992 to 1993.
Split into simpler sentences: He was in private practice in Oklahoma City, Oklahoma, 1977-1992 from 1993 to 1996. Heaton was an Adjunct instructor, University of Central Oklahoma from 1980 to 1981 and from 1992 to 1993.