Splitting trees

My earlier advise may have been a little lacking, sorry.
Is your issue with the Makgill family?
Give current "father" another wife, change parents to father and "wife2", then give "wife2" another husband. Change parents again so parents are now "husband2" and "wife2".
Then go into relationships of "wife2" and delete connection to "father"

When you get the tree split error in the conflict resolve window it is the truth. You will end up with an unconnected branch (floating profiles).

There is a workaround: As a Pro user you can cut the bad connection in the Relationships tab under edit profile.

In any case you should put some effort in avoiding the floating branch. Find a line where they belongs and connect or merge them in. If doing that first you avoid the error message as well. If not finding a place, bookmark them and make an effort co connect them later on when you have better time to do the research, and/or contact the managers asking them where they belongs.
The reason for you to cut them loose is probably as a result of a bad merge and cutting them loose are practically destroying somebody else's tree to fix your own.
The bad merged profiles should probably be replaced by new profiles in one of the branches to be able to distribute parents, siblings and children in the involved trees.

Thanks for the responses. I have contacted another manager of the info and he says it is not advised to put the info I put in there. We will see if he can correct it. Its about Catherine of Buttergask. I did not know her ancestry has been of long debate and questionable. This is what happens when new people (me) come in and try to help and gum up the works!!!