Complex sentence: Haakon was buried in the St. Magnus Cathedral in Kirkwall for the winter, and when spring came he was exhumed and his body taken back to Norway, where he was buried in the Old Cathedral in his capital Bergen.
Split into simpler sentences: Haakon was buried in the St. Magnus Cathedral in Kirkwall for the winter. When spring came he was exhumed and his body taken back to Norway, where he was buried in the Old Cathedral in his capital Bergen.