Complex sentence: Cilgerran Castle, built in 1100, from which Owain of Powys is said to have abducted Nest in 1109, is first mentioned by name in 1164.
Split into simpler sentences: Cilgerran Castle, built in 1100, from which Owain of Powys is said to have abducted Nest in 1109. It is first mentioned by name in 1164.