Complex sentence: Burr's first book, "A Separate Creation" (1996), based on a 1993 cover story he wrote for The Atlantic, investigated sexual orientation research, was published by Hyperion, a subsidiary of the Walt Disney Company.
Split into simpler sentences: Burr's first book, "A Separate Creation" (1996), based on a 1993 cover story he wrote for The Atlantic, investigated sexual orientation research. It was published by Hyperion, a subsidiary of the Walt Disney Company.