Complex sentence: The main tune is taken from a Russian song about Stenka Razin known as "Iz-za ostrova na strezhen" or "Volga, Volga mat' rodnaya" which became popular in Russia as early as the 1890s.
Split into simpler sentences: The main tune is taken from a Russian folk song about Stenka Razin known as "Iz-za ostrova na strezhen" or "Volga, Volga mat' rodnaya". The song became popular in Russia as early as the 1890s.