Sure but that's somewhat tautological and not very helpful if you seek an empirical or predictive understanding of it. The question really is what complexity of the system (meaning: all of it) is irreducible and what can at least be approximated with simplified models.

You may balk at this as being ultimately futile but our entire existence is built on trying to break apart and simplify the world we exist in, starting with the first cut between self/inside and other/outside (i.e. "this is me" vs "this is where I am" - a distinction that becomes immensely relevant after the moment of birth). Language itself only functions because we can create categories it can operate on - regardless of whether those categories consistenly map to reality itself.