Complex sentence: An important characteristic of the 10th Congress was the internal democratization of the party leadership, most notably seen in the Politburo's willingness to follow the "survey" voted by the 13th plenum of the Central Committee.
Split into simpler sentences: An important characteristic of the 10th Congress was the internal democratization of the party leadership. Most notably this was seen in the Politburo's willingness to follow the "survey" voted by the 13th plenum of the Central Committee.