Complex sentence: Once dry, they are moved to cellars to mature, with each being rinsed between up to three times per week in a mixture of water and marc, and brushed by hand to spread the bacteria evenly over the surface.
Split into simpler sentences: Once dry, they are moved to cellars to mature. Each is rinsed up to three times per week in a mixture of water and marc, and brushed by hand to spread the bacteria evenly over the surface.