Breaststroke asks swimmers to do something the other strokes do not: create power with a short front-end pull, a specialized kick, and a glide that has to be timed well enough to be useful. That is why it can look almost effortless when it is done well and completely disjointed when the pieces are out of order.
For families, breaststroke becomes easier to understand when the cycle is broken into small jobs. The pull sets up the breath. The kick supplies the real drive. The glide is not dead time. It is the payoff for doing the first two parts well.