Let me put into personal context: I have loved PKD's work for almost 40 years now, and I think I have read all that I found from him or about him. This said, good prose is different from the one he turned out. Compare him to his friend "ELRON" - now he was a master storyteller. Compare him to - say - Stephen King. He's not playing in the same league, maybe not even the same game. OTOH they did not have what he had - he was. great writer in spite of his often poor prose.
With respect, I have no personal investment in defending the quality of PKD’s prose; I wouldn’t even count him among my favorite authors. I’m a professional writer—and while that doesn’t make my opinion authoritative, as writers disagree on many points large and small, and there are fewer professional rules to observe than your high-school English teacher would have you believe— I’m offering a technical appraisal of his sentences, in the same manner that a mechanic may tell you, “no, your timing belt is fine—you have at least another fifty-thousand miles on it. Whoever told you otherwise was trying to cheat you.”
If by “ELRON” you mean L. Ron Hubbard—well, the shocks are worn out, the muffler’s falling off, and the tires are flat. The car’s totaled, and unless you have some personal attachment to it, I’d have it hauled off to the junkyard. (My opinion on King is more complicated—it’s a fine car, I suppose, if you’re partial to that make, but the brand ain’t what it used to be.)
This isn’t a great venue for sentence analysis, but reading PKD’s early, extremely funny, short story, “Oh, To Be A Blobel!” is instructive. [1] Read it aloud, if you can. Note the little details he throws away, the way he sneaks ironic jokes into seemingly objective descriptions. It’s a Borscht Belt routine masquerading as a science-fiction story, and perfectly constructed. But if this seems like “bad” writing to you, consider that you may not have entirely passed through his veil of irony.
[1] https://sickmyduck.narod.ru/pkd038-0.html