Complex sentence: Other groups composed mainly of Slavic and communist elements sprang up in Venezia Giulia; some also grew around Allied Yugoslav and Russian prisoners of war, released or escaped from captivity following the events of September 8.
Split into simpler sentences: Other groups composed mainly of Slavic and communist elements sprang up in Venezia Giulia. Others grew around Allied Yugoslav and Russian prisoners of war, released or escaped from captivity following the events of September 8.