I do think the flow chart above is a bit overcomplicated and would confuse the living crap out of someone who isn't already intimately familiar with the Saga and Palpatine's rise to Emperor of that galaxy, but it sure beats a much simpler and less interesting diagram that's dumbed down for a much younger audience.
The fallacy there is that you're equating complexity with confusing design. It's possible for a well-designed diagram to convey complex information in a clear and cohesive way. This one does not. If anything, I'd say the problem is that it's too
simple -- it lacks enough information to get things across clearly. For instance, in what order are we supposed to follow the symbols? What do the different colors and types of link represent? Why do some of the arrows go both ways?