Simplify the following text for a Grade 7 native English-speaking person.
Original: A testimonial match or testimonial game , often referred to simply as a testimonial , is a practice in some sports , notably football and especially in the United Kingdom , where a club puts on a match in honor of a player for service to the club .
Simplified: A testimonial match is an exhibition game played to raise money for a player who has been with a club for a long time .