Simplify the following text for a Grade 13 native English-speaking person.
Original: The Australian dollar ( sign : $ ; code : AUD ) is the currency of the Commonwealth of Australia , including Christmas Island , Cocos ( Keeling ) Islands , and Norfolk Island , as well as the independent Pacific Island states of Kiribati , Nauru and Tuvalu .
Simplified: The Australian dollar is also used on Christmas Island , Cocos ( Keeling ) Islands , Norfolk Island , and the independent Pacific Islands of Kiribati , Nauru and Tuvalu .