Complex sentence: The De Meones family were an Anglo-Irish family who originated in Hampshire; they moved to Ireland in the thirteenth century, became substantial landowners in Dublin and gave their name to the suburb of Rathmines.
Split into simpler sentences: The De Meones family were an Anglo-Irish family who originated in Hampshire. They moved to Ireland in the thirteenth century, became substantial landowners in Dublin and gave their name to the suburb of Rathmines.