Complex sentence: Wych Kaosayananda, a native of Thailand, is a film director who debuted as the director of "Fah" (1998), which at the time was the highest-budgeted film in the history of the Thai film industry.
Split into simpler sentences: Wych Kaosayananda, a native of Thailand, is a film director. His directorial debut was "Fah" (1998), which at the time was the highest-budgeted film in the history of the Thai film industry.