Complex sentence: New Classical architecture is a contemporary movement in architecture that continues the practice of classical, historicist and traditional architecture, that never ceased during the twentieth century, even as modernist styles became more dominant.
Split into simpler sentences: New Classical architecture is a contemporary movement in architecture, that continues the practice of classical, historicist and traditional architecture. The construction of such styles never ceased during the twentieth century, even as modernist and other post-classical styles became more dominant.