Complex sentence: The Crusader now herbalist monk in the Benedictine Abbey, Cadfael, learns by the return of the Empress's supporters to England that he fathered a son all those years ago, and learns of him when he first sees him, a grown man in his twenties.
Split into simpler sentences: The Crusader now herbalist monk in the Benedictine Abbey, Cadfael learns by the return of the Empress's supporters to England that he fathered a son all those years ago. Cadfael learns of him when he first sees him, a grown man in his twenties.