Complex sentence: Na Dae-yong (Hangul: 나대용; Hanja: 羅大用) was a Korean naval officer who fought against the Japanese navy in Imjin war and was also as known as a designer of the turtle ship.
Split into simpler sentences: Na Dae-yong (Hangul: 나대용; Hanja: 羅大用) was a Korean naval officer. He was also as known as a designer of the turtle ship.