Simplify the following text for a Grade 7 native English-speaking person.
Original: However , William J. Murray states that the term derives from the commercial benefits of the two clubs ' rivalry , which were viewed with distaste in some quarters in the early days of the game .
Simplified: However , William J. Murray states that the term comes from the commercial benefits of the two clubs ' rivalry , which were viewed with distaste in some parts in the early days of the game