Complex sentence: Fuller's earth is usually highly plastic, sedimentary clays or clay-like earthy material used to decolorize, filter, and purify animal, mineral, and vegetable oils and greases.
Split into simpler sentences: Fuller's earth is usually highly plastic, sedimentary clays or clay-like earthy material. It is frequently used to decolorize, filter, and purify animal, mineral, and vegetable oils and greases.