Complex sentence: Fulfilling McGrady's cynical expectations, the book was wildly successful; however, as sales continued to increase, many of the co-authors felt guilty about the large amounts of money they were earning, and went public.
Split into simpler sentences: Fulfilling McGrady's cynical expectations, the book was wildly successful. As sales continued to increase, many of the co-authors felt guilty about the large amounts of money they were earning, and went public.