Complex sentence: In September 1936, he got excellent test scores in the nation-wide college entrance examinations, and began his study in the Department of Chemistry, Tsinghua University with the noble ideal of promoting sciences in China.
Split into simpler sentences: In September 1936, he achieved excellent test scores in the nation-wide college entrance examinations. He began his studies in the Department of Chemistry, Tsinghua University, with the noble ideal of promoting science in China.