Complex sentence: They were requested to meet Dusty Hill in a bar in Texas, which Rogers and Fulton both thought was a prank at first, and when Hill met them, they expected to be served with a cease and desist order.
Split into simpler sentences: They were requested to meet Dusty Hill in a bar in Texas, which Rogers and Fulton both thought was a prank at first. When Hill actually showed up, they expected to be served with a cease and desist order.