Complex sentence: Kingsley and Anna Jai moved to another plantation at the mouth of the St. Johns River in 1814 where they lived for 25 years, now protected by the National Park Service as Kingsley Plantation.
Split into simpler sentences: Kingsley and Anna Jai moved to another plantation at the mouth of the St. Johns River in 1814 where they lived for 25 years. It is now protected by the National Park Service as Kingsley Plantation.