Complex sentence: That night, the first night of winter, Roo, supposed to be in bed--after causing a racket practicing the Bounce indoors, he comes up with an idea and gathers everybody else t Piglet's house.
Split into simpler sentences: That night, the first night of winter, Roo, supposed to be in bed--after, causes a racket practicing the bounce indoors. He comes up with an idea and gathers everybody else at Piglet's house.