Simplifying an overly complex script

Hello, I was able to make a script to get the result I wanted, but I am sure it can be simplified. It is way to complicated and difficult to edit for how simple the end product is. Here is an image of the results of the script:

and here is a screenshot of the full script:

I am fairly inexperienced with grasshopper and tried to create this from scratch based on my current knowledge and without following any tutorials. The only way I could think of making the pipes follow the points I wanted was to single out each branch and then each list item within it to create one curve. I then just copied this group for each curve and adjusted the cull pattern to select the next set of points. There must be a better way of going about this and I would appreciate any help so that I can understand this program more. I have attached the script and a couple of more detailed images of my problem area. Beware, the script is very slow when zooming around. Thanks in advance for any help!