Complex sentence: After the defeat of revolution, Minsky becomes one of the leaders of Russian decadence and symbolism, preaches the cult of beauty and enjoyment and declares war to the public tendencies in the skill as damaging on the "cleanliness" of artistic creation.
Split into simpler sentences: After the defeat of revolution, Minsky becomes one of the leaders of Russian decadence and symbolism. These ideas represented the cult of beauty and enjoyment and declared war to the public tendencies in the skill as damaging on the "cleanliness" of artistic creation.