Complex sentence: From 1964 to 1967 he studied at the National University of Rwanda in the department of Social and Economic Sciences (Département des Sciences Économiques et Sociales), where he obtained a Degree in Economic and Social Sciences.
Split into simpler sentences: From 1964 to 1967 he studied at the National University of Rwanda in the department of Social and Economic Sciences (Département des Sciences Économiques et Sociales). There he obtained a Degree in Economic and Social Sciences.