The user is able to merge constituent records in The Raiser’s Edge to avoid duplicate data and to increase accuracy in reports, queries, exports, etc. Once constituent records have been merged, though, the merge cannot be undone. In the instance when records are merged that should not have been, users are able to revert to a backup from before the merge was done
Restore from a backup of the database to retrieve both records. This way, the records will appear individually prior to being merged.