 Complete the following phrase:  1994 was one of the most tragic and controversial seasons in the sports history. The San Marino Grand Prix saw the deaths of Austrian rookie Roland Ratzenberger and three-time World Champion Ayrton Senna details; while a number of other incidents throughout the season resulted in injuries to drivers, mechanics, spectators and a track marshal. The FIA subsequently made sweeping changes to the rules and regulations of F1 in an effort to improve safety. Schumacher won six of the first seven races, building a significant lead for himself in the Drivers Championship and for Benetton-Ford in the Constructors Championship; he was then disqualified from two races and banned from two more, Williams driver Damon Hill winning all four to reduce Schumachers lead to a single point by the final race in 