Simplify the following text for a Grade 13 native English-speaking person.
Original: It was one of the effects of the strong opposition to the ideas of the positivism and developed the nature of decadence , of neoromanticism , of symbolism , of impressionism , and of the Art Nouveau .
Simplified: It was a result of strong aesthetic opposition to the ideas of Positivism . MÅ oda Polska promoted trends of decadence , neo-romanticism , symbolism , impressionism and art nouveau .