How best to correct incorrect merges
I have come across a few families in my tree that appear to be based on incorrect merges e.g. similar names but demonstrably wrong dates, different countries, etc. How do I rewind these incorrect merges?
Some are so entangled that it occurs to me that it might be best (and certainly easier) to just enter new profiles that I know to be correct but then the question arises as to how to detach/unlink the incorrect profiles?