Complex sentence: Throughout the 1920s, the Squad was standardised and expanded, the establishment was expanded to 40 officers, under the command of a Detective Superintendent, along with being given the designation of "C1" for "Central".
Split into simpler sentences: Throughout the 1920s, the squad was standardised and expanded, and the establishment was expanded to forty officers, under the command of a Detective Superintendent. The squad was given the designation of "C1" for "Central".