Original: When the Caliphate dissolved in 1031, the territory split into small Taifas, and gradually the Christian kingdoms started the Reconquest up to 1492, when Granada, the last kingdom of Al-Andalus fell under the Catholic Monarchs.
Simplified: In 1031 the territory split into small territiries, and gradually the Christian kingdoms started the Reconquest up to 1492, when Granada, the last kingdom of Al-Ándalus fell under the Spanish Kings.