Complex sentence: Sigurd travels to the court of Heimar, who is married to Bekkhild, sister of Brynhild, and then to the court of Gjúki, where he comes to live.
Split into simpler sentences: Sigurd travels to the court of Heimar, who is married to Bekkhild, sister of Brynhild. Afterwards, he travels to the court of Gjúki, where he comes to live.