Piet Wilhelm of GMA Triton Fight Center in Broken Arrow, OK has a simple way of not only escaping from side control but reversing the situation.
Once your guard is passed and your opponent has full control, trap their arm like an armbar and roll. Sit through, and even have the chance to submit from this position.
Piet explains in this video below:
Check out Triton Fight Center at www.tritonfightcenter.com