Complex sentence: The area was developed on lands previously owned by the Barons of Castleknock, Baronets of Abbotstown and Barons Holmpatrick and historically these lands formed the principal seat in the Parish and Barony of Castleknock.
Split into simpler sentences: The area was developed on lands previously owned by the Barons of Castleknock, Baronets of Abbotstown and Barons Holmpatrick. Historically these lands formed the principal seat in the Parish and Barony of Castleknock.