Complex sentence: The actual city was founded by the muslims around the Ayub castle, the ancient inhabitants of Bilbilis was moving to the new place, the city was conquisted for Christians by Alfonso I of Aragon in 1120.
Split into simpler sentences: The actual city was founded by the muslims around the Ayub castle. The ancient inhabitants of Bilbilis moved to the new place; the city was conquered for Christians by Alfonso I of Aragon in 1120.