Complex sentence: At the end, R.L. Stine reminds the viewers that werewolves don't exist, waves goodbye to the audience, and in a twist ending, it reveals that Stine's arm has changed into a werewolf's.
Split into simpler sentences: At the end, R.L. Stine reminds the viewers that werewolves don't exist. And in a twist ending, as Stine waves goodbye to the audience, it reveals that his arm has changed into a werewolf's.