Sometimes it can be useful to create a slide that is hard to understand. If your technology is really complicated and impossible to replicate, why not show it?
They easy way to show a complicated chart is to take a few pages of code, and shrink them down to font size 7. While this gives you a complicated chart, it does not convince your audience how clever your technology is.
The best way to show complexity is take a micro case example, show that it is complex, but explain it very clearly. A recent client had a very powerful real-time customer screening algorithm. To show the power of the technology, I visualized all the checks that are conducted within 0.1 s. The chart was highly readable and very clear. Still it was complex. And that was exactly the message we wanted to convey to potential investors.