It's not. That's the magic of it. What could have been as convoluted as, say, Neon Genesis Evangelion has been so well-crafted that even a child could understand it. It remains, however, that something happens almost every 10 seconds, and everything takes a toll on the overall story. Almost every moment is brick-shitting, so revealing it would really ruin a lot of the effect on a show that is so reliant on build-up.