Complex sentence: Kemalism strove to control religion and transform it into a private affair rather than an institution interfering with politics, scientific and social progress, "sane reason," and "the liberty of (one's) fellow man," as Atatürk once put it.
Split into simpler sentences: Kemalism strove to control religion and transform it into a private affair rather than an institution interfering with politics, scientific and social progress. "Sane reason," and "the liberty of (one's) fellow man," as Atatürk once put it.