Complex sentence: Soaking the concrete in water creates low chemical density in the pores, and applying the crystalline chemical as a coating then creates a high chemical density, and these two then diffuse through the inner structure of the concrete until they reach equilibrium throughout the inner structure.
Split into simpler sentences: Soaking the concrete in water creates a low chemical density in the pores, and applying the crystalline chemical as a coating then creates a high chemical density. These two fluids diffuse through the inner structure of the concrete until they reach equilibrium throughout the inner structure.