Complex sentence: In 1156 Knud V married with Princess Helena of Sweden, daughter of King Sverker I and his first wife Ulvhild; in consecuence, Richeza became in the step mother-in-law of her own son.
Split into simpler sentences: In 1156 Knud V married with Princess Helena of Sweden, daughter of King Sverker I and his first wife Ulvhild. In consecuence, Richeza became in the step mother-in-law of her own son.