Complex sentence: Nguyễn Ngọc Độ was a Mikoyan-Gurevich MiG-21 pilot of the Vietnamese People's Air Force, he flew with the 921st fighter regiment and tied for fourth place amongst Vietnam War fighter aces with six kills.
Split into simpler sentences: Nguyễn Ngọc Độ was a Mikoyan-Gurevich MiG-21 pilot of the Vietnamese People's Air Force. He flew with the 921st fighter regiment and tied for fourth place amongst Vietnam War fighter aces with six kills.