Complex sentence: The fatal flaw, according to Tchaikovsky scholar David Brown, is the fugue Tchaikovsky wrote to convey the Arimane hoarde's reaction to Manfred's appearance amongst them.
Split into simpler sentences: The fatal flaw, according to Tchaikovsky scholar David Brown, is the fugue. The composer wrote it to convey the Arimane hoarde's reaction to Manfred's appearance amongst them.