Complex sentence: Although not a conservative himself, he did not agree with the Bosheviks extrimism and, while working, for a short time, with Maxim Gorky at the World Literature publishing house, he criticized them.
Split into simpler sentences: Although not a conservative himself, he did not agree with the Bolshevism. While working for a short time with Maxim Gorky at the World Literature publishing house, he criticized them.