Simplify the following text for a Grade 7 native English-speaking person.
Original: Modular origami can be classified as a sub-set of multi-piece origami , since the rule of restriction to one sheet of paper is abandoned . However , all the other rules of origami still apply , so the use of glue , thread , or any other fastening that is not a part of the sheet of paper is not generally acceptable in modular origami .
Simplified: Modular origami is used to make large structures that can not be made with one sheet of paper .