Complex sentence: Rubashov frequently thinks of No.1's portrait, as if trying to decipher No.1's thoughts, and fondly remembers the men in the portrait of the delegates to the first party congress, as if trying to recall a lost age.
Split into simpler sentences: Rubashov frequently thinks of No.1's portrait, as if trying to decipher the man's thoughts. He fondly recalls the delegates to the first party congress, as if trying to recall a lost age.