Lao She
Lao She advocated the use of Baihua, the use of plain language in written Chinese. Baihua evolved a new language from classic Chinese during the May Fourth Movement.  As the All-China League of Resistance Writers leader, he found he needed to abandon the use of classical Chinese for a more accessible modern style. Lao She was an early user of Baihua and other writers and artists followed his lead. Modern written Chinese is largely in the plainer Baihua style.