Complex sentence: Marc Denis joined on September 10,2005 to host Winning Weekends on the station, and became the host, programmer and producer of Saturday Night Oldies (The New SNO with Marc Denis) on July 27,2007.
Split into simpler sentences: Marc Denis joined on September 10,2005 to host "Winning Weekends" on the station. Denis became the host, programmer and producer of "Saturday Night Oldies" on July 27,2007.