Complex sentence: The spirit of one of Mikoto's friends who was killed by the Man With Long Arms while she was playing Demon Tag, she was pulled through the wall in the Doll Room and attempts to play tag with you.
Split into simpler sentences: The spirit of one of Mikoto's friends who was killed by The Man With Long Arms while she was playing Demon Tag. She was pulled through the wall in the Doll Room and attempts to play tag with you.