Complex sentence: Derfel Cadarn (Cadarn meaning mighty) also known as ST Derfel was one of Arthurs Warlords, he turned from a soldiers life to that of the hermit and spiritual advisor, later monk and abbot of Bardsey.
Split into simpler sentences: Derfel Cadarn (Cadarn meaning mighty), also known as St. Derfel, was one of Arthur's Warlords. He turned from a soldier's life to that of the hermit and spiritual advisor, and later to that of a monk and abbot of Bardsey.