Simplify the following text for a Grade 7 native English-speaking person.
Original: The region of Tamil Nadu in modern India has been under continuous human habitation since prehistoric times , and the history of Tamil Nadu and the civilization of the Tamil people are among the oldest in the world .
Simplified: The history of Tamil Nadu goes back to the early stone age . The region of Tamil Nadu ( now one of the states in the south of India ) has been under continuous human habitation since prehistoric times .