Complex sentence: The remaining contestants were each given a single egg, and were given 30 minutes to make a dish featuring whatever ingredients they wanted, with the only stipulation being that the egg had to be the centerpiece of the dish.
Split into simpler sentences: The remaining contestants were each given a single egg, and were given 30 minutes to make a dish featuring whatever ingredients they wanted. The only stipulation was that the egg had to be the centerpiece of the dish.