Complex sentence: Ochs still tries to claim Sophie for himself after having realized the truth about the Marschallin and Octavian/Mariandel's relationship, even attempting to blackmail the Marschallin, but is ordered to leave gracefully.
Split into simpler sentences: Ochs still tries to claim Sophie for himself after realizing the nature of the relationship shared by the Marschallin and Octavian/Mariandel. He even attempts to blackmail the Marschallin, but is ordered to leave gracefully.