Complex sentence: Cement base renders are also incorrect, as these form an impermeable barrier to moisture-when the inevitable cracking occurs during cold weather, water is trapped behind the surface and penetrates inside the softer stone, thus causing rapid deterioration.
Split into simpler sentences: Cement base renders are also incorrect, as these form an impermeable barrier to moisture. When the inevitable cracking occurs during cold weather, water is trapped behind the surface and penetrates inside the softer stone, thus causing rapid deterioration.