Complex sentence: Nurhaci, who had generally good opinion toward Korea, did not invade Korea again; however, when Nurhaci died and Hong Taiji succeeded him as ruler of the Manchus, the Manchus again began to seek for chance for another war.
Split into simpler sentences: Nurhaci, who had generally good opinion toward Korea, did not invade Korea again. However, when Nurhaci died and Hong Taiji succeeded him as ruler of the Manchus, the Manchus again began to seek for chance for another war.