Simplify the following text for a Grade 10 native English-speaking person.
Original: Ñ Ð '' , Mongol khel ) is the best-known member of the Mongolic language family and the language of most of the residents of Mongolia , where it is officially written with the Cyrillic alphabet and of around three million Mongolian speakers in the Inner Mongolia Autonomous Region of China , where it is officially written with the traditional Mongolian script .
Simplified: The Mongolian language ( in Mongolian script : , ' ; in Mongolian Cyrillic : , ' ) is the official language of Mongolia and the best-known member of the Mongolic language family . It may have about 5.2 million speakers , including the vast majority of the residents of Mongolia and many of the Mongolian residents of the Inner Mongolia autonomous region of China .