This piece beings with a run-on sentence, giving two examples of what did not happen. It then explains what did, but without anything to signal the change of flow. While a more dramatic shift might be called for, I chose a minimally invasive way to distance the second sentence from the first by reusing his first name.
Original:
He wasn’t late to the airport, he didn’t get lost in the terminal. He never made it into the terminal because he wouldn’t partake in either a whole body scan or a physical pat-down of his genitals.
Corrected:
He wasn’t late to the airport, and he didn’t get lost in the terminal. John never made it into the terminal because he wouldn’t partake in either a whole body scan or a physical pat-down of his genitals.