Complex sentence: In 1996, he was an assistant director on "Channel 69" (1996) and three years later, he was involved in the scriptwriting and production of Kang Je-gyu's blockbuster "Shiri" (1999).
Split into simpler sentences: In 1996, he was an assistant director on "Channel 69" (1996). In 1999, he was involved in the scriptwriting and production of Kang Je-gyu's blockbuster "Shiri" (1999).