Complex sentence: A particularly famous textbook example is the 18-mile long Chesil Beach in Dorset, England, which also happens to be a tombolo connecting the Isle of Portland to the mainland west of the resort of Weymouth.
Split into simpler sentences: A particularly famous textbook example is the 18-mile long Chesil Beach in Dorset, England. It is also a tombolo connecting the Isle of Portland to the mainland west of the resort of Weymouth.