Simplify the following text for a Grade 10 native English-speaking person.
Original: Approximately half of the land in Kakadu is aboriginal land under the Aboriginal Land Rights ( Northern Territory ) Act 1976 and most of the remaining land is currently under claim by Aboriginal people .
Simplified: About half of the land in Kakadu is aboriginal land under the Aboriginal Land Rights ( Northern Territory ) Act 1976 . Most of the remaining land is currently under claim by Aboriginal people .