Complex sentence: Vigeland Sculpture Park in the centre of the large Frognerparken is maybe the most famous park in Norway, being located in the district of Oslo called Frogner, west of the city centre.
Split into simpler sentences: Vigeland Sculpture Park is maybe the most famous park in Norway. It is also called "Frognerparken", being located in the district of Oslo called Frogner, west of the city centre.