Simplify the following text for a Grade 12 native English-speaking person.
Original: With more than 60 booksellers , millions of books and 15,000 visitors , it has become the largest collection of books in any regional center of Australia and the major Victorian regional book event .
Simplified: With more than 60 book sellers , millions of books , and 15,000 visitors , it has become the largest collection of books in any regional center of Australia and the biggest Victorian regional book event .