How is the Flynn Restaurant Group able to manage 1245 restaurants?

The Flynn Restaurant Group is a food chain franchise holding company founded by Greg Flynn. He owns 283 Taco Bells, 135 Paneras, 458 Applebees, and 369 Arbys. I'm amazed by this and I'm wondering how his company is able to manage all of this? What is the business structure, how many employees are there, and what do these people in the company do?