Complex sentence: In 2002 he won the AKA Australian Junior National Championship on dirt and then moved to circuit karts and won the 2003 CIK/FIA Australian Junior Intercontinental A Championship.
Split into simpler sentences: In 2002 he won the AKA Australian Junior National Championship on dirt. In 2003 he moved to circuit karts and won the CIK/FIA Australian Junior Intercontinental A Championship.