Complex sentence: Bookpeople was one of the major forces behind the renaissance of independent publishing that occurred during this period, by providing a wide range of otherwise hard-to-find titles to bookstores throughout the U.S. and the world.
Split into simpler sentences: Bookpeople was one of the major forces behind the renaissance of independent publishing that occurred during this period. The business provided a wide range of hard-to-find titles to bookstores throughout the U.S. and the world.