Complex sentence: Ellaria Sand is the paramour of Prince Oberyn Martell, and the mother of the four youngest "Sand Snakes", who accompanies Oberyn to King's Landing when Oberyn takes the seat on the small council.
Split into simpler sentences: Ellaria Sand is the paramour of Prince Oberyn Martell, and the mother of the four youngest "Sand Snakes". She accompanies Oberyn to King's Landing when Oberyn takes the seat on the small council.