Complex sentence: Gwendolen was the daughter of Corineus of Cornwall and was married to Locrinus, with whom she had one son, Maddan; however, Locrinus was in love with Estrildis, the daughter of the king of Germany whom he rescued from Humber the Hun.
Split into simpler sentences: Gwendolen was the daughter of Corineus of Cornwall and was married to Locrinus, with whom she had one son, Maddan. However, Locrinus was in love with Estrildis, the daughter of the king of Germany whom he rescued from Humber the Hun.