Any AI/service that can translate legal writings to a more understandable version?

If you can't understand the original document, you can't verify any LLM's rewrite. Ask a real lawyer for help.

That's a bit extreme? In general yes they should get a lawyer but I'm not calling mine every time Facebook updates their eula or whatever. But more than that, are we going to pretend that having the answer doesn't make solving a math problem easier? You might have gotten the wrong answer yourself but with the key you can figure out how to get there. Or with language, I have maybe an a2 reading comprehension in Turkish, but if I have the translation already I can be sure I'm remembering words correctly and suddenly I'm more like b1. I won't trust the translation 100% if it's Google translate or whatever but it still gets me a lot further than if I had nothing.
- The reason you ask a lawyer and not an LLM if you can't understand the original document is because LLMs regularly misinterpret and hallucinate, and you might have no way to verify that what it says is true.
  The LLM doesn't know things. It isn't "the key" or "the answer". I don't think this user is talking about translating a legal document from another actual language or anything.
- If you trust LLM users to even try comprehending anything with their own brains, I have a bridge to sell you.

Don't forget that the reason it takes years to understand legal jargon is that each word has a very specific meaning, often jurisdiction related. And that law students spend years understanding this meaning and their limit.

Getting a llm to translate it, may miss the jurisdiction dependencies, and over simplify some parts, let alone the issue with AI Hallucinations

Just use whatever LLM you consider acceptable. However, don't trust the initial summary or simplified version. Always ask follow-up questions and you may find that the first version had some flaws. You could ask the LLM something like: "Is Facebook saying that they may sell my data to anyone? Answer based on the provided EULA." Tell it to quote the relevant part of the document to back up the claim. See if the original EULA actually has that part. If so, read it a few times and let it sink in. Using this method, you can jump quickly to the part you find most relevant to any concerns you may have about the contract.

You could try Google's new NotebookLM if the legal writing is a book, or even just a long document

Otherwise just use any llm and ask step by step checking references