Source: short audio clip
...but I am sure that modern web browsers will perform these steps in parallel and that is a lot more complicated than I'm making it out to sound, okay? But my bare-bones explanation here should serve as the general series of steps...
I would have no problem understanding that if he said it like this: and that is a lot more complicated than I'm making it sound. But that's not what he actually says. He threw an out in there for some reason and I don't understand why.