Complex sentence: Italian colonists were settled in the Dodecanese Islands of the Aegean Sea in the 1930s by the Fascist Italian government of Benito Mussolini, Italy having been in occupation of the Islands since the Italian-Turkish war of 1911.
Split into simpler sentences: Italian colonists were settled in the Dodecanese Islands in the 1930s by the Fascist Italian government of Benito Mussolini. The Kingdom of Italy occupied the Dodecanese Islands in the Aegean sea during the Italian-Turkish war of 1911.