Complex sentence: He attended Bates College (Maine State Seminary) in Lewiston, Maine from 1858 to 1862, until enlisting as a Corporal in the Union Army on August 29,1862.
Split into simpler sentences: He attended Bates College, in Lewiston, Maine from 1858 to 1862. After college he enlisted as a Corporal in the Union Army on August 29,1862.