Complex sentence: Unlike them, he was a master improviser whose stream of consciousness vocals ranged far afield from the original lyrics, along with wild interpolations of nonsense syllables such as "MacVoutie O-reeney".
Split into simpler sentences: Unlike them, he was a master improviser whose stream of consciousness vocals ranged far from the original lyrics. He sang wild interpolations of nonsense syllables, such as "MacVoutie O-reeney".