Complex sentence: Newhart wanted the title to be "The Most Celebrated New Comedian Since Attila the Hun", but Warner Bros. executives created the album's title and Newhart had to settle for his idea as a subtitle.
Split into simpler sentences: Newhart wanted the title to be "The Most Celebrated New Comedian Since Attila the Hun". But Warner Bros. executives created the album's title and Newhart had to settle for his idea as a subtitle.