I have trouble reading long passages too. I like reading but it's hard to stay with it.

What I find helps is to have the book read aloud as I'm reading it. I use the Kindle app to read books and in it there's an option to read the text aloud.

The audio is AI generated, I think, so it's flat and factual. But reading what it is saying at the same time is really helpful. I used that many times with the last book I read and I was able to finish and remember it.

So I think you're on the right track with the audiobook but maybe try reading along at the same time.