Complex sentence: Introduced near the end of season three as the daughter resulting from an affair between Irina Derevko and Arvin Sloane, Nadia grew up in an orphanage and is the half-sister of Sydney Bristow.
Split into simpler sentences: Introduced near the end of season three, Nadia is the daughter resulting from an affair between Irina Derevko and Arvin Sloane. She is the half-sister of Sydney Bristow.