Simplify the following text for a Grade 5 native English-speaking person.
Original: When the two teams meet it is known as the ` East Anglian derby ' , or , informally , as the ` Old Farm derby ' , a comic reference to the ` Old Firm Derby ' played between Scottish teams Celtic and Rangers .
Simplified: When these two teams play , the game is called the `` East Anglian derby '' . The derby is usually refeard to as the old farm derby .