help please sort out my problem

My iPhoto library was reset by Apple Technical Support and all event names and descriptions were lost. I was warned this would happen and before the process a copy of the iPhoto library was made. I deleted the iPhoto Library copy. However a large proportion of the photos had been imported from my PC and I still have these on an external hard drive. Is there an easy way to import these photos (which have descriptions) into iPhoto and delete the corresponding duplicates from iPhoto leaving in place the newer photos to which I can add event names and descriptions more easily?
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