Complex sentence: The city of Plymouth, Devon, England is bounded by Dartmoor to the north, the river Tamar to the west, the open expanse of water called Plymouth Sound to the south and the river Plym to the east.
Split into simpler sentences: The city of Plymouth, Devon, England is bounded by Dartmoor to the north, the river Tamar to the west. The open expanse of water called Plymouth Sound to the south and the river Plym to the east.