Complex sentence: Baldrick uses his underpants to beat back the "T. Rex", who takes one sniff and collapses, revealing that Baldrick's underpants were responsible for the dinosaurs' extinction.
Split into simpler sentences: Baldrick uses his underpants to beat back the "T. Rex", who takes one sniff and collapses. It is implied that Baldrick's underpants were responsible for the dinosaurs' extinction.