Complex sentence: The Pippinids or Arnulfings are the members of a family of Frankish nobles whose select scions served as Mayor of the Palace, de facto rulers, of the Frankish kingdoms of Neustria and Austrasia that were nominally ruled by the Merovingians.
Split into simpler sentences: The Pippinids or are the members of a family of Frankish nobles in the. Their select scions served as Mayor of the Palace, de facto rulers, of the Frankish kingdoms of Neustria and Austrasia that were nominally ruled by the Merovingians.