Complex sentence: The Blackshirts were established as the "squadristi" in 1919 and consisted of many disgruntled former soldiers which may have numbered 200,000 by the time of Mussolini's March on Rome from October 27 to October 29,1922.
Split into simpler sentences: The Blackshirts were established as the "squadristi" in 1919 and consisted of many disgruntled former soldiers. They may have numbered 200,000 by the time of Mussolini's March on Rome from October 27 to October 29,1922.