Complex sentence: Dartmoor, and particularly the River Dart is notable as a focal point for whitewater kayakers and canoeists, recognised as one of the most popular natural whitewater rivers in England by quantity of people as well as quality of water features.
Split into simpler sentences: Dartmoor, and particularly the River Dart is notable as a focal point for whitewater kayakers and canoeists. It is recognised as one of the most popular natural whitewater rivers in England by quantity of people as well as quality of water features.