Complex sentence: The date 27 March is attested in the biography by Anne Quéruel; according to Fétis, Pitou and Elizabeth Forbes, on the other hand, his death was on 30 March.
Split into simpler sentences: The date 27 March is attested in the biography by Anne Quéruel. On the other hand, Fétis, Pitou and Elizabeth Forbes give the date of his death as 30 March.