Complex sentence: The Black Widow Bike was the bike central to the first two episodes of American Chopper and was the first sign to American Chopper fans of Paul Jr. 's obsession with spiders and spider webs.
Split into simpler sentences: The Black Widow Bike was the bike central to the first two episodes of American Chopper. This bike was the first sign to fans of American Chopper of Paul Jr. 's obsession with spiders and spider webs.