Complex sentence: Didur made his Metropolitan Opera debut on November 14,1908, singing Mephistopheles in Charles Gounod's "Faust", remaining with the company for a quarter of a century and becoming one of its principal bass singers.
Split into simpler sentences: Didur made his Metropolitan Opera debut on November 14,1908, singing Mephistopheles in Charles Gounod's "Faust". He remained with the company for a quarter of a century and becoming one of its principal bass singers.