Complex sentence: She remained loyal to Mussolini until the end, and was arrested in 1945 by Italian Partisans in Switzerland (she fled Italy after World War II) and was turned over to the Americans as a harmless matron and was released after several months.
Split into simpler sentences: She remained loyal to Mussolini until the end, and was arrested in 1945 by Italian Partisans in Switzerland (she fled Italy after World War II). She was turned over to the Americans and was released after several months.