Simplify the following text for a Grade 8 native English-speaking person.
Original: CHERUB is a series of young adult spy novels , written by the English author Robert Muchamore , focusing around a division of the British Security Service named CHERUB , which employs minors , predominantly orphans , as intelligence officers .
Simplified: It is written by English author Robert Muchamore . The series is about a division of the British Security Service named CHERUB .