Simplify the following text for a Grade 5 native English-speaking person.
Original: The main building , often called `` the Met '' , is one of the world 's largest art galleries ; there is also a much smaller second location , at `` The Cloisters '' , in Upper Manhattan , which features medieval art .
Simplified: The main building is one of the world 's largest art galleries . There is also a much smaller second location .