Complex sentence: During testing the Kerrison Predictor provided accurate fire control to a range in excess of, and the Bofors gun was reliable, and in fall 1940, the Ordnance Department standardized the Kerrison Predictor for use with the 37 mm gun.
Split into simpler sentences: During testing the Kerrison Predictor provided accurate fire control to a range in excess of, and the Bofors gun was reliable. In the fall of 1940, the Ordnance Department standardized the Kerrison Predictor for use with their 37 mm gun.