Complex sentence: He also starred in a Hong Kong martial art film "Bodyguards and Assassins", which was released on December 18,2009; his film was the first time he worked with and had a fight scene with Hong Kong martial arts superstar Donnie Yen.
Split into simpler sentences: He also starred in a Hong Kong martial art film Bodyguards and Assassins, which was released on December 18,2009. This film was the first time he worked with and had a fight scene with Hong Kong martial arts superstar Donnie Yen.