Original sentence: Northern Ireland is sometimes referred to as "Ulster".Three counties in the historic province of Ulster, Cavan (An Cabhán), Donegal (Dún na nGall/Tír Chonaill) and Monaghan (Muineachán) are however part of the Republic of Ireland.Ulster (Irish: Uladh) is one of the four historic provinces on the island of  Ireland
Edited sentence: However Nationalists do not accept such an equation, given that three counties in Ulster, Cavan (An Cabhán), Donegal (Dún na nGall/Tír Chonaill) and Monaghan (Muineachán) are part of the Republic of Ireland.Some people in the Unionist community refer to Northern Ireland as "Ulster".Ulster (Irish: Uladh) is one of the four provinces on the island of  Ireland