Complex sentence: The city extends over from north to south and from west to east, mainly north of the River Ruhr, which forms the "Lake Baldeney" reservoir in the boroughs of Fischlaken, Kupferdreh, Heisingen and Werden.
Split into simpler sentences: The city extends over from north to south and from west to east, mainly north of the River Ruhr. The Ruhr forms the "Lake Baldeney" reservoir in the boroughs of Fischlaken, Kupferdreh, Heisingen and Werden.