Complex sentence: The first, featuring roastee Denis Leary (and produced by Leary's production company, Apostle), aired on August 10,2003 and was the most watched program in the channel's history, excluding episodes of "South Park".
Split into simpler sentences: The first, featuring roastee Denis Leary (and produced by Leary's production company, Apostle), aired on August 10,2003. The roast was the most watched program in the channel's history, excluding episodes of "South Park".