Complex sentence: In 2000, he switched to the CART circuit with Team Rahal-Letterman winning the "Rookie of the Year" title and finishing as runner-up in 2001, winning a season-high 4 victories and 6 pole positions.
Split into simpler sentences: In 2000, he switched to the CART circuit with Team Rahal-Letterman winning the Rookie of the Year title that year. He finished 2nd in the driver's championship in 2001, winning a season-high 4 victories and 6 pole positions.