Simplify the following text for a Grade 10 native English-speaking person.
Original: The Territory of Cocos ( Keeling ) Islands , also called Cocos Islands and Keeling Islands , is a territory of Australia , located in the Indian Ocean , southwest of Christmas Island and approximately midway between Australia and Sri Lanka .
Simplified: The Territory of Cocos ( Keeling ) Islands , also called Cocos Islands and Keeling Islands , is a territory of Australia .