Complex sentence: Horan became more interested in prophecy, and published an electronic book entitled "A Glorious New World Very Soon to Come", that predicted the end of the world, and an electronic booklet along similar lines entitled "A Glorious New World".
Split into simpler sentences: Horan became more interested in prophecy and published an electronic book, entitled "A Glorious New World Very Soon to Come", that predicted the end of the world. He published another electronic booklet along similar lines entitled "A Glorious New World".