Complex sentence: However, he was convinced by his father-in-law, the daimyo of Owari province, to instead resign as daimyo; it was under these conditions that Harunori came to be daimyo of Yonezawa.
Split into simpler sentences: However, he was convinced by his father-in-law, the daimyo of Owari province, to instead resign as daimyo. It was under these conditions that Harunori came to be daimyo of Yonezawa.