Article, Sentence, Composition
The writing chapter on its own is more like an article or something like that. Even if it's a sentence long. So it covers just about every type of writing there is.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
Who wrote this article?
Koichi is such a good writer.
I don’t like Haruki Murakami’s cheesy, pompous writing style very much.