Complex sentence: Decommissioned in 1961, she was then operated by the Dutch Naval Cadet Corps (Zeekadetkorps Nederland), in 1995 was designated for preservation, and opened for visitors in July 1997 at the Dutch Naval Museum at Den Helder.
Split into simpler sentences: Decommissioned in 1961, she was then operated by the Dutch Naval Cadet Corps (Zeekadetkorps Nederland). In 1995, she was designated for preservation, and opened for visitors in July 1997 at the Dutch Naval Museum at Den Helder.