Complex sentence: Kvaternik and his Italian and Hungarian allies made a plan to destroy Austria by instigating simultaneous revolts in both the Croatian Military Frontier and in Venice, while Giuseppe Garibaldi would land his troops in the northern Dalmatia.
Split into simpler sentences: Kvaternik and his Italian and Hungarian allies made a plan to destroy Austria. They would raise simultaneous revolts in both the Croatian Military Frontier and Venice, while Giuseppe Garibaldi would land his troops in the northern Dalmatia.