Complex sentence: Cheng won the Australian Junior Championships in January 2010 at age 12, the youngest player ever to do so, won the same title again in 2011, and was awarded the title of Australian Junior Player of the Year in 2009 and 2010.
Split into simpler sentences: Cheng won the Australian Junior Championships in January 2010 at age 12, the youngest player ever to do so, and won the same title again in 2011. He was awarded the title of Australian Junior Player of the Year in 2009 and 2010.