Complex sentence: In July 1942, the ARMIR was created when Italian dictator Benito Mussolini scaled up the Italian effort in the Soviet Union and the Italian Expeditionary Corps in Russia ("Corpo di Spedizione Italiano in Russia", or CSIR) was expanded to become the ARMIR.
Split into simpler sentences: In July 1942, the ARMIR was created when Italian dictator Benito Mussolini decided to scale up the Italian effort in the Soviet Union. The existing Italian Expeditionary Corps in Russia ("Corpo di Spedizione Italiano in Russia", or CSIR) was expanded to become the ARMIR.