Every time I write something I intend to be permanent I reread what I've written multiple times out loud. I find complicated sentences, or related phrases that are unnecessarily far apart, or words that I'd never use in speech. Then I make modifications to minimize these. So even aside from reading what others write, I think you can only write well yourself if you assiduously read what you write.
It's kind of like having a weird uncle in the family: after we see this guy running around the living room naked for some years, we think it's ordinary, fine, ok: "oh, it's just Uncle Bob", we tell ourselves.
Then we go to college, come home for vacation after meeting new people, lost the "familiarity" of family life, and when we finally see Uncle Bob running around the living room naked, our reaction is not one of jovial acceptance like before, but one of horror.