Complex sentence: Penske would supply Patrick with two PC-18 chassis for 1989, and in return, Penske would take driver Fittipaldi and sponsor Marlboro starting with the 1990 season.
Split into simpler sentences: Penske would supply Patrick with two PC-18 chassis for the 1989 season for Fittipaldi to drive. In return, Penske would take driver Fittipaldi and sponsor Marlboro starting with the 1990 season.