Jīngguò yí duàn shíjiān de zhìliáo, tā de bìngqíng míngxiǎn hǎozhuǎn.
After a period of treatment, his condition improved markedly.
Tips
usage
好转 is commonly used for health (病情好转 = condition improving), weather (天气好转 = weather clearing up), and economic/social situations. The opposite is 恶化 (èhuà, to deteriorate).