Complex sentence: This man then serves as another narrator in relaying to his traveling companion stories of his interactions with Grigory Alexandrovich Pechorin, the main character of the story and the ultimate Byronic hero.
Split into simpler sentences: This man then serves as another narrator in relaying to his traveling companion stories of his interactions with Grigory Alexandrovich Pechorin. The main character of the story and the ultimate Byronic hero.