Iran Political System Infographic
Nicolas Rapp—an Art Director for the Associated Press—has produced a timely and simple infographic depicting Iran’s “complex and unusual political system”.
Iran’s political system combines elements of democracy and religion. Institutions controlled by the Supreme Leader [elected by the Assembly of Experts] are balanced by an elected president and parliament.
Wikipedia’s Politics of Iran article (and the accompanying infographic) also helped my understanding, as did the BBC’s take on the issue.