Complex sentence: Their friends, Shane and Shana, get revenge on Tabby and Lee and take them to a neighborhood where you get endless candy but two jack-o-lanterns keep them trick or treating saying "you will trick or treat forever" and scared the bullies.
Split into simpler sentences: Their friends, Shane and Shana, get revenge on Tabby and Lee. These jack-o-lanterns keep them trick or treating by saying "you will trick or treat forever", which scared the bullies.