What is your question? If you just want to know why Ulysses is seen as influential you can start with the wikipedia article. If you want to try again to read it you can try to read it with a guide of some kind, there are multiple, I used this one https://www.ulyssesguide.com/1-telemachus.

No question. It's completely against my being to consider something as good if it can't be enjoyed without a guide. I hated the tendency in computer science to hide simple definitions behind jargon. I'm okay with stuff having hidden meaning, with texts being interpretable, I'm not okay with it just being gibberish when not studying it in closest detail.

I'm aware that some think this book is influential, I'm not clear on how widespread that belief is. Also, whether regular readers really like it. And no, Wikipedia does not clear that up.