Complex sentence: Young was the youngest male to win a Grand Slam event, winning the Australian Open Junior Championships in 2005, a record he held until the Australian Open in 2008, when Bernard Tomic won the event 2 months younger than Young.
Split into simpler sentences: Young was the youngest male to win a Grand Slam event, winning the Australian Open Junior Championships in 2005. A record he held until the Australian Open in 2008, when Bernard Tomic won the event 2 months younger than Young.