Complex sentence: The Croatan were a Native American tribe living in the coastal areas of what is now North Carolina in an area that is now Dare County, and encompasses the Alligator River, Croatan Sound, Roanoke Island, and parts of the Outer Banks including Hatteras Island.
Split into simpler sentences: The Croatan were a Native American tribe living in the coastal areas of what is now North Carolina. They lived in current Dare County, an area encompassing the Alligator River, Croatan Sound, Roanoke Island, and parts of the Outer Banks, including Hatteras Island.