Simplify the following text for a Grade 9 native English-speaking person.
Original: The acquisition of 797 bookstores turned the company into a nationwide retailer , and as of the end of fiscal year 1999 , the second-largest online bookseller in the United States .
Simplified: The purchase of 797 bookstores turned the company into a nationwide retailer . As of the end of fiscal year 1999 , the second-largest online bookseller in the United States .