Simplify the following text for a Grade 5 native English-speaking person.
Original: The name M&M comes from the founders name Forrest E. Mars Sr. . The other M comes from the name of the president of the Hershey Company , William F. R. Murrie .
Simplified: One M was for Forrest E. Mars Sr. , and one for Bruce Murrie , the son of Hershey 's Chocolate president William F. R. Murrie .