Complex sentence: Liebig also propagated Carl Sprengel's "Theorem of minimum" (known as Law of the Minimum), stating that a plant's development is limited by the one essential mineral that is in the relatively shortest supply, visualized as "Liebig's barrel".
Split into simpler sentences: Liebig also propagated Carl Sprengel's "Theorem of minimum" (known as Law of the Minimum), stating that plant growth is not determined by the total resources available, but by the scarcest available resource. A plant's development is limited by the one essential mineral that is in the relatively shortest supply, visualized as "Liebig's barrel".