Simplify the following text for a Grade 12 native English-speaking person.
Original: Under President and CEO Reynolds , the park operated until April 13 , 2003 , when it closed after a prolonged tourism decline following the September 11 , 2001 , terrorist attacks .
Simplified: Under President and CEO Reynolds , the park ran until April 13 , 2003 , when it closed after a long tourism decline following the September 11 , 2001 terrorist attacks .