Original: Compton's by Britannica, first published in 2007, incorporating the former Compton's Encyclopedia, is aimed at 10-17 year olds and consists of 26 volumes and 11,000 pages.
Simplified: Compton's by Britannica, published in 2007, with the old Compton's Encyclopedia, in it is written for teenagers who are 10 - 17 years old and has 26 books and 11,000 pages in it.