Simplify the following text for a Grade 5 native English-speaking person.
Original: The first generation S3 is built on the same A platform of the Audi A3 , Volkswagen Golf Mk4 , Audi TT , SEAT LeÃ n and Å koda Octavia .
Simplified: The Audi A3 is a car produced by Audi since 1996 . It is based on the Volkswagen Golf 's platform , and it is currenty in its Second Generation .