Complex sentence: Following the October Revolution with its outspoken atheist ideology, around 1923, the Palekh masters of iconography began to paint papier-mâché boxes applying the same principles they had learned from painting icons.
Split into simpler sentences: Following the October Revolution with its outspoken atheist ideology. Around 1923, the Palekh masters of iconography began to paint papier-mâché boxes while applying the same principles they had learned from painting icons.