Complex sentence: Since the current restrictor plate era commenced in 1988 qualifying has been established as the best single lap of two; with drivers permitted one un-timed warm-up lap, followed by two consecutive timed laps.
Split into simpler sentences: Since the current restrictor plate era commenced in 1988 qualifying has been established as the best single lap of two. Drivers are permitted one un-timed warm-up lap, followed by two consecutive timed laps.