Simplify the following text for a Grade 10 native English-speaking person.
Original: The Britannicas articles are found in the Micro - and MacropÃ dia , which encompass 12 and 17 volumes , respectively , each volume having roughly one thousand pages .
Simplified: The Britannicas articles are found in the MicropÃ dia and MacropÃ dia , which contain 12 and 17 books , respectively , each book having about one thousand pages .