Complex sentence: Surviving an attack at sea by a Stormdog, a weather creature created by the Winterking Arkan, the journey North sees a deterioration in the relationship between Cadvan and Maerad.
Split into simpler sentences: Surviving an attack at sea by a Stormdog, a weather creature created by the Winterking Arkan, Maerad and Cadvan make the journey North. Thereafter the reader sees a deterioration in the relationship between Cadvan and Maerad.