Complex sentence: Onshore Lippett had arranged for the officers from the "Duchessa d'Aosta" to be invited to a dinner party, 12 Italian officers, and two German officers from the "Likomba", attended.
Split into simpler sentences: Onshore Lippett had arranged for the officers from the "Duchessa d'Aosta" to be invited to a dinner party. Twelve Italian officers, and two German officers from the "Likomba", attended.