Complex sentence: In 1316, when she was 13 she married Ulf Gudmarsson of the family of Ulvåsa, lord of Närke, to whom she bore eight children, four daughters and four sons, all of them survived infancy, which was very rare at that time.
Split into simpler sentences: In 1316, when she was 13 she married Ulf Gudmarsson of the family of Ulvåsa, lord of Närke, to whom she bore eight children, four daughters and four sons. All of them survived infancy, which was very rare at that time.