Original sentence: However that usage is controversial and disputed by Nationalists and by geographers who use the term exclusively to apply to the nine-county province of Ulster.Northern Ireland is sometimes referred to by Unionists as "Ulster".Seven of Northern Ireland's eighteen MPs (all nationalists) are Catholic, while one of Ulster's ten TDs is Protestant.Three counties in the 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 provinces on the island of  Ireland
Edited sentence: Northern Ireland is sometimes referred to as "Ulster".Seven of Northern Ireland's eighteen MPs are Catholic, while one of Ulster's ten TDs is Protestant.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