Simplify the following text for a Grade 9 native English-speaking person.
Original: After the 1984 season , Formula Two was upgraded to Formula 3000 in an attempt to merge F2-style chassis with the normally-aspirated 3000cc Cosworth DFV V8 engines that were by now obsolete in the all-turbocharged Formula One .
Simplified: After the 1984 season , Formula Two was upgraded to Formula 3000 . This was an attempt to merge F2-style chassis with the normally-aspirated 3000cc Cosworth DFV V8 engines .