Complex sentence: The clan is said to descend from Ánrothán Ua Néill, an Irish prince of the O'Neill dynasty, and through him Niall Noigíallach, High King of Ireland.
Split into simpler sentences: The clan is said to descend from Ánrothán Ua Néill, an Irish prince of the O'Neill dynasty. As a part of this lineage, the clan claims descent from the legendary Niall Noigíallach, High King of Ireland.