Complex sentence: At that time she adopted the name Milanov, which was the stage name of her second husband, an actor, because according to Milanov herself, "Kunc" wasn't "glamourous" enough for the Metropolitan Opera.
Split into simpler sentences: At that time she adopted the name Milanov, which was the stage name of her second husband, an actor. According to Milanov herself, "Kunc" wasn't "glamourous" enough for the Metropolitan Opera.