With difficulty if the break/damage is in the centre of the cassette.
If the tape is very important or sentimental there are several online services available. You may even find a someone locally. Locally, I suggest you ask in Photographic Suppliers or Photographers for recommendations as they probably get asked occasionally if old wedding videos and such can be repaired or copied.
Look for a company that will both repair the original AND provide you with a NEW COPY of the original.
For online services, type "video cassette repair" in a search engine, eg. Google
Cobweb
January 2005