I can see your point now, and we are in agreement that nested clauses are uncommon and at the very least sound unnatural in Sinitic languages, but it is distinct from «The sentences simply can't be very long and often don't have any connecting words between sentences».

Strictly speaking, complex nested clauses are slowly on the way out of English as well due to the analytical nature of its present form, which is what the cited article partially laments, and remain a distinctive feature of highly inflected languages (German, Scandinavian, Slavic, etc.).