Complex sentence: Prime Minister of Singapore Lee Hsien Loong expressed his condolences over the missing AirAsia flight, saying, Sorry to learn that an AirAsia aircraft from Surabaya to Singapore has gone missing.
Split into simpler sentences: Prime Minister of Singapore Lee Hsien Loong expressed his condolences over the missing AirAsia flight. He said Sorry to learn that an AirAsia aircraft from Surabaya to Singapore has gone missing.