Complex sentence: You have to get 3 or more frogs of the same color in a row and facing the same direction, once you do that, those frogs go "ribbit", or "croak", and the lily pads they're standing on light up.
Split into simpler sentences: You have to get 3 or more frogs of the same color in a row and facing the same direction. Once you do that, the lily pads they're standing on light up.