Simplify the following text for a Grade 7 native English-speaking person.
Original: The first was in 1970 , commemorating James Cook 's exploration along the east coast of the Australian continent , followed in 1977 by a coin for Queen Elizabeth II 's Silver Jubilee , the wedding of Charles , Prince of Wales and Lady Diana Spencer in 1981 , the Brisbane Commonwealth Games in 1982 , and the Australian Bicentenary in 1988 .
Simplified: The Brisbane Commonwealth Games had a special coin in 1982 . Another one was made for the Australian Bicentenary in 1988 .