Complex sentence: In March 1912 Pratt accompanied Murray to the Presidio, where the general took command of the Army's Western Department, and on December 16,1912, transferred to the 1st Cavalry, posted at the Presidio.
Split into simpler sentences: In March 1912 Pratt accompanied Murray to the Presidio, where the general took command of the Army's Western Department. On December 16,1912, Pratt was transferred to the 1st Cavalry, which was posted at the Presidio.