Complex sentence: The cars are the first ever SimBin's extensive introduction of American muscle cars, such as the Chevy Camaro Concept, Dodge Challenger and Dodge Charger SuperBee, while still retaining the Seat Leon, BMW 3-series and the Formula 3000 cars.
Split into simpler sentences: The cars are first ever SimBin's extensive introduction of American muscle cars, such as the Chevy Camaro Concept, Dodge Challenger and Dodge Charger SuperBee. While still retaining the Seat Leon, BMW 3-series and Formula 3000 cars.