@copyrite - do you mean how you see the authors displayed in your calibre library UI?
You should not attempt your first example - & is the character calibre users to denote multiple authors, and trying to circumvent that with a ; instead will just screw up your database.
For the second example, you can do this with the latest version of the Quality Check plugin, which has an option in the Fix menu which toggles authors between FN LN and LN, FN format.
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