Complex sentence: These were first shown off during the 1994 Daytona 500, and four demonstration races were held during the season at Mesa Marin Raceway had six trucks, Portland Speedway, Saugus Speedway and Tucson Raceway Park.
Split into simpler sentences: These were first shown off during the 1994 Daytona 500, and four demonstration races were held during the season. The other three events were held at Portland Speedway, Saugus Speedway, and Tucson Raceway Park.