Complex sentence: When he returned to China in October 1933, he was arrested by the Kuomintang government for signing the illegal arms treaty with the Soviet Union, and was brought to trial in March 1935, where he was sentenced to three and-a-half years imprisonment.
Split into simpler sentences: When he returned to China in October 1933, he was arrested by the Kuomintang government for signing the illegal arms treaty with the Soviet Union, and was brought to trial in March 1935. Here he was sentenced to three and-a-half years imprisonment.