Simplify the following text for a Grade 13 native English-speaking person.
Original: The Territory of Ashmore and Cartier Islands are two groups of small low-lying uninhabited tropical islands in the Indian Ocean situated on the edge of the continental shelf north-west of Australia and south of the Indonesian island of Rote .
Simplified: The Territory of Ashmore and Cartier Islands is two groups of small low-lying uninhabited tropical islands in the Indian Ocean north-west of Australia and south of the Indonesian island of Roti .