Simplify the following text for a Grade 8 native English-speaking person.
Original: A stamp album is a book , often loose-leafed ( with its papers not attached to the book , but hanging loose inside ) , in which a collection of postage stamps may be stored and displayed .
Simplified: A stamp album is a book , often loose-leafed ( to allow for expansion ) , in which a collection of postage stamps may be stored and displayed .