Well “complex” might not be the best term here. The universe is evidence of creative intelligence, it can’t be evidence for anything else I think.
So “intelligence” is a better term than “complex” - IMHO.
Furthermore, intelligence is not causal, it can cause but is not itself a result of some other cause, it is the origin of cause, it causes.
Some claim the universe is deterministic, but if that’s true, then what is the origin of determinism? it can only be non-determinism, i.e intelligence.