Complex sentence: Shin Chae-ho (1880--1936) was a Korean independence activist, a Historian and an nationalist, the founder of the nationalist historiography of Korea, and is often referred to as "Korea's greatest historian" by both North and South Koreans.
Split into simpler sentences: Shin Chae-ho (1880--1936) was a Korean independence activist, historian, nationalist and the founder of the nationalist historiography of Korea. He is often referred to as "Korea's greatest historian" by both North and South Koreans.