Complex sentence: Adjacent to the town is the regional Heringsdorf Airport, before border controls between Poland and Germany were abolished in 2007 in accordance with the Schengen agreement a border checkpoint with Świnoujście restricted to pedestrian/bicycle/bus traffic existed briefly.
Split into simpler sentences: Adjacent to the town is the regional Heringsdorf Airport, before border controls between Poland and Germany were abolished in 2007 in accordance with the Schengen agreement. A border checkpoint with Świnoujście that was restricted to pedestrian/bicycle/bus traffic existed briefly.