Complex sentence: Some wish that Joyner had written the book as fiction so that the book could be marketed to a larger audience and avoid many of the controversies surounding it, while others (including the author) say that the author cannot lie about what happened to him.
Split into simpler sentences: Some wish that Joyner had written the book as fiction so that the book could be marketed to a larger audience and avoid many of the controversies surrounding it. However, others (including the author) say that the author cannot lie about what happened to him.