Complex sentence: Yuh Woon-Hyung (May 25,1886--July 19,1947) was a Korean politician who argued that Korean independence was essential to world peace, and a reunification activist who struggled for the independent reunification of Korea since its national division in 1945.
Split into simpler sentences: Yuh Woon-Hyung (May 25,1886--July 19,1947) was a Korean politician who argued that Korean independence was essential to world peace. And reunification activist who had struggled for the independent reunification of Korea since its national division in 1945.