Simplify the following text for a Grade 12 native English-speaking person.
Original: The Islamic Caliphate and other Islamic states took over the Middle East , Caucasus and Central Asia during the Muslim conquests of the 7th century , and later expanded into the Indian subcontinent and Malay archipelago .
Simplified: The Islamic caliphate and other Islamic states took over the Middle East starting in the 7th century , and later expanded into India and Indonesia .