Complex sentence: The highest elevations of the Sauerland are the "Langenberg" (843m) near Olsberg, and much better known because of a weather observation station is the "Kahler Asten" (842m) near Winterberg.
Split into simpler sentences: The highest elevations of the Sauerland are the "Langenberg" (843m) near Olsberg. Much better known, because of its weather observation station, is the "Kahler Asten" (842m) near Winterberg.