Complex sentence: After a crash in pre-season testing by regular driver JJ Lehto (who broke a neck vertebra), Verstappen drove in the first two races of the season as a substitute, partnering Michael Schumacher and made his Formula One debut at the 1994 Brazilian Grand Prix.
Split into simpler sentences: After a crash in pre-season testing by regular driver JJ Lehto (who broke a neck vertebra), Verstappen drove in the first two races of the season as a substitute, partnering Michael Schumacher. Verstappen made his Formula One debut at the 1994 Brazilian Grand Prix.