Complex sentence: In 1941, the Guard's 115th Observation Squadron was federalized into the United States Army Air Corps, assigned to the Fourth Air Force and sent to Sherwood Field, Paso Robles in northern San Luis Obispo County.
Split into simpler sentences: In 1941, the 115th was mobilized into the Army Air Corps, assigned to Fourth Air Force. Was sent to Sherwood Field, Paso Robles in northern San Luis Obispo County.