Complex sentence: She confronts Stephen about their marriage and the deceit involved and how when all their friends supported Stephen, Margo had been left alone to reconcile the changes in her life and losing the family she loved.
Split into simpler sentences: She confronts Stephen about their marriage and the deceit involved. She points out that when all their friends supported Stephen, Margo had been left alone to reconcile the changes in her life and losing the family she loved.