If that's the only copy there's not much you can do. At the cost of losing formatting, justification, bold, underline, and several other things, one way you might "clean it up" is to Select All and copy to Notepad, then copy/paste back the other direction. This wouldn't get everything either, but might clarify your mess.
Have you tried opening this using the Recover Text from Any File option? You will lose your formatting but you may get the bulk of the text back. It does sound as though the file has become corrupted. See more information on the at:
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