Complex sentence: The farms had developed from the Fleming estate; the Flemings being the ruling family in the area, living at Cumbernauld Castle, who acquired the area after Robert the Bruce murdered the previous laird, Red Comyn.
Split into simpler sentences: The farms had developed from the Fleming estate; the Flemings being the ruling family in the area, living at Cumbernauld Castle. They acquired the estate after Robert the Bruce murdered the previous laird, Red Comyn.