Complex sentence: As the weather worsened several ships slipped their anchors and got safely to sea but others were driven ashore between Carrag Luz, Pedn-y-ke and Meres Ledges.
Split into simpler sentences: As the weather worsened several ships slipped their anchors. Some managed to get safely to sea but others were driven ashore between Carrag Luz, Pedn-y-ke and Meres Ledges.