Complex sentence: He was a defensive assistant coach with the Atlanta Falcons from 2002 to 2005 and with the New Orleans Saints from 2006 to 2010 before being promoted to defensive coordinator of the Denver Broncos for the 2011 season.
Split into simpler sentences: He was a defensive assistant coach with the Atlanta Falcons from 2002 to 2005. He served as defensive coordinator of the Denver Broncos for the 2011 season.