Complex sentence: Iced water is then poured or dripped over the sugar cube in a manner whereby the water is slowly and evenly displaced into the absinthe, such that the final preparation contains 1 part absinthe and 3-5 parts water.
Split into simpler sentences: Iced water is poured or dripped over the sugar cube to slowly and evenly distribute the water into the absinthe. The final preparation contains 1 part absinthe and 3-5 parts water.