Complex sentence: White kidnaps David, Fred, Amy, Bark Lee, and John, who has returned his consciousness to his body, and takes them to a mall, where he reveals a "ghost door" that can only be opened by Amy.
Split into simpler sentences: White kidnaps David, taking him to a mall, along with Fred, Amy, her dog, and John, who has returned his consciousness to his body. At the mall, White reveals a "ghost door", which can only be opened by Amy.