Complex sentence: Tatarsky is invited to join an all-powerful PR firm run by a cynically ruthless advertising genius, Leonid Azadovsky, who invites Tatarsky to participate in a secret process of rigged elections and false political advertising.
Split into simpler sentences: Tatarsky is invited to join an all-powerful PR firm run by a cynically ruthless advertising genius, Leonid Azadovsky. Azadovsky invites Tatarsky to participate in a secret process of rigged elections and false political advertising.