Complex sentence: The living family member s problematic behavior or circumstance is a repetition of--or compensation for--a trauma that occurred in the past. This phenomenon was first identified by Iván Böszörményi-Nagy, who called them "Invisible Loyalties".
Split into simpler sentences: The living family member's problematic behavior or circumstances are a repetition of-or compensation for-a trauma that occurred in the past. This phenomena was first identified by Iván Böszörményi-Nagy, who called them "Invisible Loyalties".