Complex sentence: Skeptical about architecture's ability to change the "unjust society", Niemeyer defended that such activism should be undertaken politically, and thus simplifying architecture for such purposes would be anti-modern (as it would be limiting constructive technology).
Split into simpler sentences: Skeptical about architecture's ability to change an "unjust society", Niemeyer defended that such activism should be undertaken politically. Using architecture for such purposes would be anti-modern (as it would be limiting constructive technology).