Simplify the following text for a Grade 7 native English-speaking person.
Original: Shiraz metro is the subway system of Shiraz , the capital city of Fars Province and the largest city in southern Iran with a population of over 1.2 million in the city and over 1.7 million in the metropolitan area .
Simplified: Shiraz is an important city in Southern Iran . About 1.2 million people live there .