Complex sentence: The barbs are designed to puncture and flatten tires when a vehicle is driven over them, usually the barbs are hollow to allow air to escape at a steady pace in an attempt to reduce the risk of the driver crashing into oncoming traffic or the surroundings.
Split into simpler sentences: The barbs are designed to puncture and flatten tires when a vehicle is driven over them. Usually the barbs are hollow to allow air to escape at a steady pace in an attempt to reduce the risk of the driver crashing into oncoming traffic or the surroundings.