Complex sentence: The Dukes Dock is a dock, on the River Mersey and part of the Port of Liverpool it is situated in the southern dock system, connected to Canning Dock to the east and the Mersey to the west.
Split into simpler sentences: The Dukes Dock is a dock, on the River Mersey and part of the Port of Liverpool. It is situated in the southern dock system, connected to Canning Dock to the east and the Mersey to the west.