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You're looking for the bulk metadata search and replace feature. Select the books you want to change, bring up the bulk metadata edit dialog (either hit the E key on your keyboard or right-click and select the appropriate entry in the context menu) and open the last tab of that dialog.
You'll need to use the regular expression search mode. There are several topics discussing how to change author names through regular expressions, do a forum search for a phrase like "change author name sort" and you should find some helpful threads.
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