Complex sentence: The lands listed as Earl Edwin's, centered on Bolton Abbey and now laying waste, were soon after this date given to Robert de Romille and since the Saxon manse at Bolton Abbey was beyond repair Romille built a new castle at Skipton.
Split into simpler sentences: The lands listed as currently Earl Edwin's, centered on Bolton Abbey and now laying waste, were soon after this date given to Robert de Romille. Since the Saxon manse at Bolton Abbey was beyond repair Romille built a new castle at Skipton.