Complex sentence: The lack of ice time often forced the Oilers to practice in a Mall where they were not allowed to shoot pucks, for extra practice Vanbiesbrouck had tennis balls hit at him in the parking lot.
Split into simpler sentences: The lack of ice time often forced the Oilers to practice in a Mall where they were not allowed to shoot pucks. For extra practice Vanbiesbrouck had tennis balls hit at him in the parking lot.