Simplify the following text for a Grade 6 native English-speaking person.
Original: In 2009 , the park hosted approximately 9.7 million guests , ranking it the fourth-most visited amusement park in the United States , and seventh-most visited in the world .
Simplified: In 2009 , the park had around 9.7 million guests , ranking it the fourth-most visited amusement park in the United States , and seventh-most visited in the world .