Complex sentence: Along with the "Samtgemeinde" of Hesel, it is one of two in the county, and comprises three municipalities-Detern, Filsum and Nortmoor-which merged in the wake of local government reform in 1973.
Split into simpler sentences: Along with the "Samtgemeinde" of Hesel, it is one of two in the district. It was formed in the wake of local government reform in 1973.