Complex sentence: She finds Debbie's Ouija board in the closet, and she tells Trevor about how she and Debbie would play it and answer each other's questions about their crushes, etc. when they were little.
Split into simpler sentences: She finds Debbie's Ouija board in the closet. Trevor appears and Laine tells him about how she and Debbie would play with the board and answer each other's questions when they were little.