Complex sentence: She tries to remedy that, by pulling him aside and asking him to dump Yukana and go out with her, but when Jun refuses, she gets very angry and threatens him until Ranko saves him by threatening to reveal her net identity.
Split into simpler sentences: She tries to remedy that by pulling him aside and asking him to dump Yukana and go out with her. When Jun refuses, she gets very angry and threatens him until Ranko saves him by threatening to reveal her net identity.