Complex sentence: It is located in "Hönnetal", a narrow valley created by the river Hönne, which is near the Sorpesee, formerly part of Balve, and at the north end of the Sauerland, near Dortmund.
Split into simpler sentences: It is located in "Hönnetal", a narrow valley created by the river Hönne, which is near the Sorpesee, formerly part of Balve. The river itself is situated at the north end of the Sauerland, near Dortmund.