source: Nor could they offer a convincing reason for believing another six months of diplomacy will make a difference. # There won't be changes after another six months of diplomacy.
target: Nor could they offer a convincing reason for believing another six months of diplomacy will make a difference. And since It is possible to believe that another six monts will make a difference only if they can offer reasons. There won't be changes after another six months of diplomacy.