Complex sentence: Barker made a guest appearance on the show on April 16,2009 to promote his autobiography, "Priceless Memories," appearing during the Showcase round and gave copies of the book to the audience.
Split into simpler sentences: Barker made a guest appearance on the show on April 16,2009, to promote his autobiography, "Priceless Memories". He appeared during the Showcase round and gave copies of the book to the audience.