If the output is close enough to the surface then that's it, the water level drops and breaks the siphon naturally. Less than ideal, but common is to drill a hole just a little bit below the water line, this way as the water drops it hits the hole and breaks the siphon, problem is those holes can get plugged up when you are least expecting it.
I have my return going from the pump to flexible tubing, to a rigid PVC arm that is secured to the wall and goes up and over the top of the tank, then has some loc line on the actual output so I can manipulate how the flow is directed.