Complex sentence: But it is also used in both directions, for example, when product samples stand for certain properties they possess; while the label'green' refers to a certain property of a product sample, the sample refers to the same property by exemplifying it.
Split into simpler sentences: But it is also used in both directions, for example, when product samples stand for certain properties they possess. While the label'green' refers to a certain property of a product sample, the sample refers to the same property by exemplifying it.