Complex sentence: It was granted as a title for the male heirs apparent of the subsequent dukes of Alba, who until then held the marquisate of Coria before succeeding to the dukedom of Alba.
Split into simpler sentences: It was granted as a title for the male heirs apparent of the subsequent dukes of Alba, who until then held the marquisate of Coria before succeeding to the dukedom. The dukedom was only to be held by the male heirs apparent of the dukes of Alba.