These two Individuals should not have been Merged and now cannot be unmerged.

SLCPark

The undo merge has been disabled. How do we correct errors if we are unable to undo an incorrect merge. Do we start over with Thomas Morgan with a new ID? My Thomas Morgan was born in Wales and was still living in Wales in 1861 when he was 66 years old: https://www.familysearch.org/ark:/61903/3:1:3Q9M-CSQZ-59NN-2?view=index&personArk=%2Fark%3A%2F61903%2F1%3A1%3AM7HV-53X&action=view&cc=1493747&lang=en&groupId=

Áine.ní.Donnghaile

When changes have been made after the merge, you can still restore the "Deleted Person Before Merge."
From the profile of MTX3-BHL, use "Restore Person"

You'll want to review both profiles after using Restore to make sure any events or sources are on the correct profile.

Hope this helps!