To break a bead with some control over the result, I recommend this:

Find a stout steel needle, such as a darning needle. You should be able to insert it into the perforation, part-way.

On a firm surface, set the bead upright with the needle inserted, and hold it with your left hand. With your right hand, use a mallet or hammer to strike the needle. Ideally, the needle will enter and split the bead into two or three pieces.

You will have a clear view of the interior. And perhaps you can do something with the pieces.

Good luck! Jamey