Complex sentence: When the war broke out, European public opinion heavily favored the Germans; many Italians attempted to sign up as volunteers at the Prussian embassy in Florence and a Prussian diplomat visited Giuseppe Garibaldi in Caprera.
Split into simpler sentences: When the war broke out, European public opinion heavily favored the Germans. For example, many Italians attempted to sign up as volunteers at the Prussian embassy in Florence, and a Prussian diplomat visited Giuseppe Garibaldi in Caprera.