Complex sentence: Between the 5th and 12th centuries, an Irish sept claiming descent from Coirpre mac Néill ruled a barony of north Tethbae, their territory near lough Sheelin called Cairpre Gabra, roughly corresponding to the barony of Granard in modern county Longford.
Split into simpler sentences: Between the 5th and 12th centuries, an Irish sept claiming descent from Coirpre mac Néill ruled a barony of north Tethbae, called Cairpre Gabra. Their "Cairbre" territory corresponds to the barony of Granard in modern county Longford.