Complex sentence: A change in the belief that the revolution had been a generally positive change began in late 1980s and 1990s, but Zhang Shizhao was quoted as arguing that When talking about the Xinhai Revolution, the theorist these days tends to overemphasize.
Split into simpler sentences: A change in the belief that the revolution had been a generally positive change began in late 1980s and 1990s. But Zhang Shizhao was quoted as arguing that When talking about the Xinhai Revolution, the theorist these days tends to overemphasize.