Complex sentence: They also proceeded to blame the Bolsheviks for the demonstrations, though it is unclear whether the Bolshevik party actually orchestrated the entire event, or if it was simply a spontaneous demonstration that happened to include Bolshevik supporters.
Split into simpler sentences: They also proceeded to blame the Bolsheviks for the demonstrations. There is question on whether the Bolshevik party orchestrated the entire event, or if it was simply a spontaneous demonstration that happened to include Bolshevik supporters.