Complex sentence: He assumed the role of head coach at Southern Miss on December 2,1990 and held it for 17 years until November 26,2007 when he resigned effective after the Papajohns.com Bowl to be played on December 22,2007.
Split into simpler sentences: He assumed the role of head coach at Southern Miss on December 2,1990 and held it for 17 years. He will resign effective immediately after the Papajohns.com Bowl to be played on December 22,2007.