Complex sentence: He also joins a small apocalyptic religious group, which shares his belief in extra-sensory perception, telepathy and UFOs and believes the world will end on April 23,1959.
Split into simpler sentences: He also joins a small apocalyptic religious group, which shares his belief in extra-sensory perception, telepathy and UFOs. According to Jack's coreligionists, the world will end on April 23,1959.