Complex sentence: Schumacher stayed out beyond the three laps required to adhere to the penalty, and was then shown the black flag meaning he was excluded from the race and from that point would have to return to the pits and retire.
Split into simpler sentences: Schumacher stayed out beyond the three laps required to adhere to the penalty, which was imposed. Schumacher was then shown the black flag meaning he was excluded from the race and from that point would have to return to the pits and retire.