Original sentence: All but one of the Unionists were re-elected, many with extremely large majorities.The sole exception to this pattern was the Newry and Armagh by-election, where Seamus Mallon of the Irish nationalist Social Democratic and Labour Party (SDLP) was able to take the seat
Edited sentence: All but one of the Unionists were re-elected against pro-Agreement opponents, many with extremely large majorities.The sole exception to this pattern was the Newry and Armagh by-election, where Seamus Mallon of the Irish nationalist and pro Anglo-Irish Agreement Social Democratic and Labour Party (SDLP) was able to take the seat