Look, this isn't meant as a slam or an edition war. But those are all non-complex sentences, with simple vocabulary. They're all (subject verb object), and there aren't a bunch of modifying clauses. It's not "high language".
When I first read those paragraphs circa 1989, and still now, yes I do cringe a little bit. 1E players didn't need to be told literary examples of what constitutes a fighter/cleric -- they'd already know! You don't find the same thing at the start of the 1E PHB, because it would be wasted space.
Those paragrahs above are almost precisely what let me know I could comfortably skip 2E in its entirety.
1e was not complex language, it was just poorly written prose. Throwing in a couple vocab words that I somehow understood when I was 8, does not make it for the highbrow smarty pants intellectual types. I just don't get this argument. AD&D came out when I was around 6, I started playing it when I was 8, and I had no problem understanding any of it. I think people are fooling themselves on how adult and complicated 1e was.