Complex sentence: The Alexandra 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 Hornby Dock to the north and Langton Dock to the south.
Split into simpler sentences: The Alexandra 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 Hornby Dock to the north and Langton Dock to the south.