Complex sentence: The agreement specified that the Republic could control the islands of Java, Sumatra and Madura while the Dutch controlled the other islands; however, the Dutch broke the agreement by launching "Operation Product", an operation commenced to invade the Republican's territory.
Split into simpler sentences: The agreement specified that the republic could control the islands of Java, Sumatra and Madura while the Dutch controlled the other islands. However, the Dutch broke the agreement by launching "Operation Product", an operation commenced to invade the republican's territory.