Complex sentence: Ronald Peter Erhardt (February 27,1931--March 21,2012) was an American football coach at both the collegiate and professional levels, and from 1979 to 1981 served as head coach of the National Football League's New England Patriots.
Split into simpler sentences: Ronald Peter Erhardt (February 27,1931--March 21,2012) was an American football coach at both the collegiate and professional levels. From 1979 to 1981 he served as head coach of the National Football League's New England Patriots.