Complex sentence: The current city of Arnsberg was created in 1975 by merging 14 cities and muncipalities into one city, old Arnsberg itself and Neheim-Hüsten as the two urban parts, while the other parts are very rural.
Split into simpler sentences: The current city of Arnsberg was created in 1975 by merging 14 cities and muncipalities into one city. Old Arnsberg itself and Neheim-Hüsten are the two urban parts, while the other parts are very rural.