Complex sentence: The Port of Hamburg (German mostly: "Hamburger Hafen", in official usage also "Hafen Hamburg") is a German sea port, located on the river Elbe in Hamburg, some 110 kilometres from the mouth of the Elbe into the North Sea.
Split into simpler sentences: The Port of Hamburg (German mostly: "Hamburger Hafen", in official usage also "Hafen Hamburg") is a German sea port, located on the river Elbe in Hamburg. The harbour is located 110 kilometres from the mouth of the Elbe into the North Sea.