The visitors went in front early in the first half, before Long was fouled for two separate penalties.
The Gortnahoe native stuck one home himself, with James McClean converting the other.
And the scoring was completed on the stroke of half-time, with Paul McShane diverting a cross into his own goal.
The game was marred somewhat from an Irish perspective, though, with goalkeeper Rob Elliot being forced off with a serious-looking knee injury.
