iran before and after the saha mohammad reza pahlavi time

Write about Iran During the time of Saha (Mohammad Reza Pahlavi) and after Ruhollah Khomeini was ruling. Be specific and simple. Provide examples and clarify. Compere and contrast between the two. what are the differences. Mentation what changed and what not. Provide a good introduction and conclusion.

Preferred sources are documentaries.