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