Complex sentence: There is also an Apostolic Nunciature to Norway, as papal embassy-level diplomatic representation, which is however vested in te Apostolic Nunciature to Sweden (in Djursholm), as are the nunciatures to Denmark, Finland and Iceland, so actually covering the Nordic countries.
Split into simpler sentences: There is also an Apostolic Nunciature to Norway, as papal embassy-level diplomatic representation. However, it is vested in the Apostolic Nunciature to Sweden (in Djursholm), as are the nunciatures to Denmark, Finland and Iceland, covering the Nordic countries.