Comma usage exercise 2

Norman Bethune, a Canadian doctor, became a famous Canadian who is better known outside of Canada than in it. Bethune was born in Gravenhurst ,Ontario in 1890. As a young man he studied medicine, and in 1917 he became a doctor. At the age of 36, he was stricken with tuberculosis, a devastating lung disease. He spent about a year recovering and subsequently won worldwide fame for his experiments in lung surgery, and for his invention of instruments used in chest surgery. In 1936, Bethune joined the Republican Army in the Spanish, Civil War. When he developed the first mobile blood transfusion service in history, his fame around the world increased. The blood transfusion service allowed doctors, for the first time, to provide significant treatment to soldiers near battle fronts. In 1938, Bethune went to China, which was at war with Japan. Bethune organized field hospitals served as a battle surgeon, and set up medical schools to train Chinese surgeons. In November, 1938, he became medical chief of the Chinese, Eighth Route Army. Unfortunately, in 1939, after only 21 months in China, Bethune died of blood poisoning. Despite Bethune’s major medical innovations, most Canadians have never heard of him. However, he is considered a national hero in China, and is well known in many other parts of the world.