Complex sentence: His parents, both natives of London (England), were Jewish, and were descended from immigrants from Russia and Poland; the family's original surname, "Rudnitzky", was changed by his grandfather to "Rudd".
Split into simpler sentences: His parents, who were raised in London (England), were both Jewish, and were descended from immigrants from Russia and Poland. The family's original surname, "Rudnitzky", was changed by his grandfather to "Rudd".