Complex sentence: Caranog is said to have slain a serpent that was terrorising the inhabitants of Carrum (Carhampton), and on victory was granted by Arthur the right to settle in the village.
Split into simpler sentences: Caranog is said to have slain a serpent that was terrorising the inhabitants of Carrum (Carhampton). On victory, Caranog was granted by Arthur the right to settle in the village.