California's constitution alone is over 100 pages, never mind thousands of pages of other legal code as well as precedents. It's not that the laws are so complex, it's that they have to cover so much it's never going to be feasible for someone not doing it professionally to be an expert on it.

Folks say "you should consult with a lawyer" when the topic is something that's too obscure or marginal to be obvious to a non-lawyer... that doesn't mean the laws are overly complex, just that there are always going to be marginal situations.