Complex sentence: The Agera RS model is currently the fastest production car with a GPS confirmed two way average top speed of 277.9 mph and a fastest straight line speed achieved by the Agera was 284.55 mph.
Split into simpler sentences: The Agera RS model is currently the fastest production car with a GPS confirmed two way average top speed of 277.9 mph. The fastest straight line speed achieved by the Agera was 284.55 mph.