Complex sentence: There were several palatine districts in Ireland, of which the most notable were those of the Earls of Desmond, and the Earls of Ormond in Tipperary--the latter continued in legal existence until County Palatine of Tipperary Act 1715.
Split into simpler sentences: There were several palatine districts in Ireland of which the most notable were those of the Earls of Desmond and the Earls of Ormond in Tipperary. The latter continued in legal existence until the County Palatine of Tipperary Act 1715.