 Complete the following phrase:  After a crash in pre-season testing by regular driver JJ Lehto who broke a 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. During the race he collided with Eddie Irvine, which triggered a multiple accident also involving Éric Bernard and Martin Brundle. Verstappens car somersaulted, but he emerged unharmed. At the Pacific Grand Prix Verstappen ran 6th but spun off on cold tyres immediately after a pit stop. Lehto was fit for the next race at Imola, but his performances in subsequent races were disappointing and he was rested by Benetton following the 