He started out with,
"First, you collect the arm .... "
I think he meant that you trap the arm, but I thought the expression was hilarious, and I've called it that ever since. I've used this turnover to a pin for years and taught it to hundreds of people. For those of you who didn't quite get it, here are a sequence of photos we took for THE BOOK a while back.
1. First you collect the arm. Notice how Ronda has his arm trapped here. She hooked ABOVE HIS ELBOW and she has a grip on the opposite lapel of his gi. She is going to keep this grip through the whole move and never let it go.
2. You sweep with the leg on the same side as the arm you have collected. You hook inside his other leg with your other leg and lift. You go directly to your side. The photo below is shown at a bit different angle so that you can see the lift with the leg, because a lot of people miss that.
Also, notice that her arm is coming up around his head. Personally, I'd swing my arm and try to clock him in the head with my bicep to get more momentum going over.
3. Notice that she STILL has that same arm and the grip on the opposite lapel. Once she has him on his back she gets her legs over to the side and sinks her hips low to have a lower center of gravity which makes her harder to lift and roll over. She spreads her legs to give herself a stronger base.