Complex sentence: The Salisbury Dock is a dock, on the River Mersey and part of the Port of Liverpool it is situated in the northern end of the dock system, connected to Nelson Dock to the north and Clarence Dock to the south.
Split into simpler sentences: The Salisbury Dock is a dock on the River Mersey and part of the Port of Liverpool. The dock is situated in the northern end of the dock system, connected to Nelson Dock to the north and Clarence Dock to the south.