Complex sentence: Lyudmila Ter-Petrossian was born in Leningrad, USSR to an Jewish family of an army officer who fought in World War II and a doctor who took part in the defense of Leningrad.
Split into simpler sentences: Lyudmila Ter-Petrossian was born in Leningrad, USSR she is of Jewish descent. Her father was an army officer who fought in World War II and her mother a doctor who took part in the defense of Leningrad.