Complex sentence: The first Earl Donough MacCarty was succeeded by his grandson Charles, the second Earl; he was the son of Charles MacCarty, Viscount Muskerry, who was killed during the Second Anglo-Dutch War.
Split into simpler sentences: The first Earl Donough MacCarty was succeeded by his grandson, the second Earl. He was the son of Charles MacCarty, Viscount Muskerry, who was killed during the Second Anglo-Dutch War.