Simplify the following text for a Grade 7 native English-speaking person.
Original: The tournament was an event run by the International Tennis Federation ( ITF ) and Tennis Australia , that was part of the 2011 ATP World Tour and the 2011 WTA Tour calendars , under the Grand Slam category .
Simplified: The tournament was an event run by the International Tennis Federation ( ITF ) . It was part of the 2011 ATP World Tour and the 2011 WTA Tour calendars , under the Grand Slam group .