[cyphar]

The thing that makes legalese prone to misinterpretation is not the complexity of the words or grammar used. It's that the interpretation of a paragraph is different for a lawyer (or court) than it is for a lay-person. Just because you understood all of the words doesn't mean you actually understood the text (this is of course ignoring how insanely over-the-top the quoted paragraphs are, and the length of the text itself).

When you go through a law degree you have several subjects dedicated to "learning how to read a legal document". If it just required high school literacy, why would you ask very intelligent people to go through a literacy course in university? Because there is more to reading a legal document (such as knowing precedents in contract law, how courts interpret certain conditions, what the agreement means in the context of any related laws, and so on) than just knowing what the words mean.