Original sentence: A minority also speak Irish, and there are Gaeltacht (Irish-speaking regions) in southern Londonderry, the Gaeltacht Quarter of Belfast and in Donegal, where 25% of the total Gaeltacht population of Ireland is located
Edited sentence: A minority also speak Irish, and there are Gaeltacht (Irish-speaking regions) in southern Derry, the Gaeltacht Quarter of Belfast and in Donegal, where 25% of the total Gaeltacht population of Ireland is located