Earlier quoted context omitted.
Too bad that the legal system is made of lawyers, whose interests run directly contrary to that ideal.
Legal systems becoming complex predates the emergence of lawyers. Lawyers have also led significant efforts to simplify the law. For example the American Bar Association has consistently created simple model statute frameworks that eventually are adopted. Law is complex because society is complex.
"Simple" is not an accurate description of typical model legislation.
> Law is complex because society is complex.
Law is complex because it's an evolved system influenced by politics and corruption. The extent of its complexity is not intrinsic and much of it is specifically a defense mechanism against public understanding, because the public wouldn't support many things in the status quo if they understood the workings of them, and the people who do understand the workings but prefer the status quo use this to their advantage.