Complex sentence: The 1/1st was formed in 1914, in the city of Bath, and become part of the South Western Mounted Brigade, in October 1914 they were moved to France, and joined the 6th Cavalry Brigade, 3rd Cavalry Division.
Split into simpler sentences: The 1/1st was formed in 1914 in the city of Bath and become part of the South Western Mounted Brigade. In October 1914 it was moved to France and joined the 6th Cavalry Brigade, 3rd Cavalry Division.