Maybe I misunderstood. So the 448 page document you sent a link on is the human readable version?
As far as I understand it, yes. The real version would be the text from 1976 and about 10 more 50-100 page documents describing the changes to whatever that law from 1976 said.
You don't understand it, not because English isn't your first language, but because NOBODY can understand it. That's why there are lawyers.
I guess one would need to understand the basics of how the US government and jurisdiction works, but this honestly looks like it's a different language to english.
This is way different from what German legal documents look like to me. Those are usually fine if you know about the general way they are written and have a few crossreferences at hand. (There's even HTML versions of most if not all German laws with embedded links to mentioned other laws.)