Complex sentence: In Rolf Krake's saga, Ale is called Ale den oppländske, and called "Norwegian" which is generally regarded as a late confusion between the Swedish Uppland, the core province of the Swedes, and its namesake, the Norwegian Oppland.
Split into simpler sentences: In Rolf Krake's saga, Ale is called Ale den oppländske, and called "Norwegian". This change of ethnicity is generally regarded as a late confusion between the Swedish Uppland, the core province of the Swedes, and its namesake, the Norwegian Oppland.