Simplify the following text for a Grade 9 native English-speaking person.
Original: Stallman argues that not using GNU in the name of the operating system unfairly disparages the value of the GNU project and harms the sustainability of the free software movement by breaking the link between the software and the free software philosophy of the GNU project .
Simplified: Richard Stallman ( born March 16 , 1953 ) is the founder of the free software movement , the GNU project , and the Free Software Foundation .