How to fix SVN history after crooked hands?

Question

CVS

There is a project with several branches. One alternatively gifted developer made a new branch in his own style - by creating a new folder and stupidly copying all the files and directories. It wasn't discovered right away, but a year later, when he had already committed there, and not only him.
Is it possible to somehow re-link the old and new branch? I think it is necessary to create the branch correctly and then somehow roll out the changes from the “alternative” branch, but I can’t figure out exactly how to do this.
I will be glad to any advice.

Answer 1

svn copy -r pseudo-branch-create-revision -trunk-path-new-branch-path
svn merge -r pseudo-branch-create-revision :HEAD pseudo-branch-path-path-to-new-branch
The history is "lost", but there will be an indication of where to look for it. You can merge in several stages - then the “important” part of the story will be preserved
PS if there are better solutions, it’s interesting to read it yourself.