Simplify the following text for a Grade 8 native English-speaking person.
Original: With a permanent seating capacity for more than 257,000 people and infield seating that raises capacity to approximately 400,000 , it is the largest and highest-capacity sporting facility in the world .
Simplified: IMS has permanent seating for more than 257,000 people . The infield raises capacity to approximately 400,000 .