Complex sentence: Spock is taken by Jones'beauty and her ability to observe Kollos without its maddening effects, and in private conversation with her, she is impressed by Spock's own telepathic abilities, far stronger than her own.
Split into simpler sentences: Spock is taken by Jones'beauty and her ability to observe Kollos without its maddening effects. During early conversations, she is impressed by Spock's own telepathic abilities, as they are far stronger than her own.