Simplify the following text for a Grade 6 native English-speaking person.
Original: The sequel Rocky II , which Stallone had also written and directed ( replacing John G. Avildsen , who won an Academy Award for directing the first film ) was released in 1979 and also became a major success , grossing $ 200 million .
Simplified: The second movie Rocky II which Stallone had also written and directed was released in 1979 and also became a huge success . The money it made was over US$ 200 million .