Complex sentence: Reigning as Donald III, the new monarch represented the interests of "a resentful native aristocracy", driving out the Anglo-Saxons and Normans who had staffed the court of Malcolm and Margaret.
Split into simpler sentences: Reigning as Donald III, the new monarch represented the interests of "a resentful native aristocracy". Driving out the Anglo-Saxons and Normans who had staffed the court of Malcolm and Margaret.