Complex sentence: Her father is of Russian Jewish and Polish Jewish descent, Her mother has Irish, English, Scots-Irish, German, and distant Dutch ancestry, She was in a relationship with actor Avan Jogia from 2011 to 2016.
Split into simpler sentences: Her father is of Russian Jewish and Polish Jewish descent. Deutch was in a relationship with actor Avan Jogia from 2011 to 2016.