Complex sentence: Since the Statlers'retirement in 2002, Don has authored or co-authored three books: "Heroes and Outlaws of the Bible", "Sunday Morning Memories", and "You'll Know It's Christmas When...".
Split into simpler sentences: Since the Statlers'retirement in 2002, Don has pursued a second career as an author. He authored or co-authored three books: "Heroes and Outlaws of the Bible", "Sunday Morning Memories", and "You'll Know It's Christmas When...".