Complex sentence: In a standing start, cars are completely still when a green signal is given to start the race, often preceded by a set of lights (for example, five lights are given before all lights extinguish in Formula One races).
Split into simpler sentences: In a standing start, cars are completely still when a green signal is given to start the race. This is often preceded by a set of lights (for example, five lights are given before all lights extinguish in Formula One races).