How do I make clear and nice three level list?

Hey!

Good UI designers, I beg your for an advice :) I need to transform this ugly three level list into some nice and clear list (doesn't have to be a list). I'm soo bad in graphics and UI design. I have no idea how to make this clear. I use Semantic UI. Accordions are not the best thing I would use. Do u have any suggestions? Thank you very much :)