Complex sentence: General Gwak Jae-u (1552--1617) was a Korean patriot from Uiryeong; in 1592, nine days into Japanese invasions of Korea, he formed a militia to fight against the Japanese army.
Split into simpler sentences: General Gwak Jae-u (1552--1617) was a Korean patriot from Uiryeong. In 1592, nine days into the Japanese invasion of Korea, he formed a militia to fight against the Japanese army.