Complex sentence: Roy's interest in "Jin Ping Mei" began when he was still in China, but he did not focus on it as a specialty until he joined the faculty of the University of Chicago in 1963.
Split into simpler sentences: Roy's interest in "Jin Ping Mei" began when he was still in China. Rong (2014) He did not focus on it as a specialty, however, until he joined the faculty of the University of Chicago in 1963.