Uh, what? It's not fair to say that a vastly more complicated thing evolved from a simple thing? That's how it always happens - each step seems reasonable, and justified, but you look at what those countless rational decisions added up to, and bam. That's the complexity everyone says they hate. In technology, in government, in basically everything.

(Oddly, culture seems to be okay deprecating old bits of culture; the brain is inherently finite so we run in cycles and epicycles of cultural fashion that remains roughly at the same level of complexity.)