Complex sentence: The idea of having a five star rank, in a country whose military is so small, can be traced back to Communist origins in Yugoslavia, where Marshals and Fleet Admirals were routinely appointed in order to mirror such ranks in the Soviet Union.
Split into simpler sentences: The idea of having a five star rank, in a country whose military is so small, can be traced back to Communist origins in Yugoslavia. The Yugoslavian military, under communist rule, routinely appointed Marshals and Fleet Admirals, to mirror such ranks in the Soviet Union.