Complex sentence: The marriage of Haakon and Margaret should be seen as an alliance, and Margaret probably remained in Denmark for a while after the wedding, but before long she was taken to Akershus in Oslo Fjord, where she was raised by Merete Ulvsdatter.
Split into simpler sentences: The marriage of Haakon and Margaret should be seen as an alliance, and Margaret probably remained in Denmark for a while after the wedding. But before long she was taken to Akershus in Oslo Fjord, where she was raised by Merete Ulvsdatter.