Complex sentence: The Hamburg Rathaus is the Rathaus--the city hall or town hall--of Hamburg, Germany, it is the seat of the government of Hamburg, located in the "Altstadt" quarter in the city centre, near the lake Binnenalster and the central station.
Split into simpler sentences: The Hamburg Rathaus is the Rathaus--the city hall or town hall--of Hamburg, Germany. It is the seat of the government of Hamburg, located in the "Altstadt" quarter in the city centre, near the lake Binnenalster and the central station.