Simplify the following text for a Grade 4 native English-speaking person.
Original: On the centenary of the first flying of the flag , 3 September 2001 , the Australian National Flag Association presented the Prime Minister with a flag intended to replace the missing original flag . This flag was not a replica of the original flag , on which the Commonwealth Star had only six points , but was a current Australian National Flag with a seven pointed Commonwealth Star .
Simplified: The flag of Australia is a national flag .