Simplify the following text for a Grade 14 native English-speaking person.
Original: The 2011 Australian Open was a tennis tournament featuring six different competitions , and part of the 2011 ATP World Tour , the 2011 WTA Tour , ITF Junior Tour and the NEC Tour , as tournaments for professional ( players on the ATP or WTA tour ) , junior and wheelchair players were held .
Simplified: The 2011 Australian Open was a tennis tournament featuring six different competitions , and part of the 2011 ATP World Tour , the 2011 WTA Tour , ITF Junior Tour and the NEC Tour , as tournaments for professional , junior and wheelchair players were held .