Complex sentence: Before that he was the assistant head coach from 1998 to 2003 in he had current Auburn head coach Gene Chizik on his staff from 1998 to 2001.
Split into simpler sentences: Before that he was the assistant head coach from 1998 to 2003. He also was the assistant head coach who had current Auburn head coach Gene Chizik on his staff from 1998 to 2001.