Complex sentence: "Saeng Thian" (แสงเทียน; "Candle Light") is the first song composed by Bhumibol Adulyadej in April 1946 when he was still a prince.
Split into simpler sentences: Saeng Thian (แสงเทียน; "Candle Light") is the first song composed by Bhumibol Adulyadej. The King composed it in April 1946 when he was still a prince.