Simplify the following text for a Grade 7 native English-speaking person.
Original: Mario Tennis , known in Japan as Mario Tennis 64 , is a sports video game developed by Camelot and Nintendo for the Nintendo 64 video game console . The game was released in North America and Japan in the summer of 2000 , and released in Europe later in November .
Simplified: Mario Tennis is a video game released for the Nintendo 64 in 2000 .