Complex sentence: On 10 October 1934, he embarked on the Long March as the pioneer of 2nd division and, in the beginning of 1935, seized a critical military fortress at Loushanguan in Guizhou Province.
Split into simpler sentences: On 10 October 1934, he embarked on the Long March as the pioneer of 2nd division. In the beginning of 1935, his army attacked and seized a critical military fortress, Loushanguan in Guizhou Province.