Complex sentence: Their father, Grid, is a prolific writer and TV producer with a Ph.D. in Arts and their mother Violeta, who has a Ph.D. in philology, is a teacher of world literature.
Split into simpler sentences: Their father, Grid, is a prolific writer and TV producer; he has a Ph.D. in Arts. Their mother, Violeta, who has a Ph.D. in philology, is a teacher of world literature.