Complex sentence: During battle with Psimon in the episode "Image", her true form as a White Martian is revealed, but she manages to conceal it from her teammates, later claiming her "true form" is a female version of Martian Manhunter's human appearance.
Split into simpler sentences: During battle with Psimon in the episode "Image", he exposes her true form as a White Martian, but she manages to conceal it from her teammates. Later, she claims her "true form" is a female version of Martian Manhunter's human appearance.