Complex sentence: Lewin received his Bachelor of Arts from Tel Aviv University, Israel in 1961, and, under the supervision of Roger Portal, his Ph.D from Sorbonne, Paris in 1964.
Split into simpler sentences: Lewin received his Bachelor of Arts from Tel Aviv University, in Israel in 1961. Working under the supervision of Roger Portal, Lewin earned his Ph.D from Sorbonne, Paris in 1964.