Complex sentence: She (along with Mr. Lesko) reappears in "The Penultimate Peril" as one of the guests at Hotel Denouement who is in the lobby after being woke up by a shot from a harpoon gun that killed Dewey Denouement.
Split into simpler sentences: She (along with Mr. Lesko) reappears in "The Penultimate Peril" as a guest at Hotel Denouement. She is in the lobby after being woke up by a shot from a harpoon gun that killed Dewey Denouement.