Complex sentence: Shell-marl is very different in its nature from clayey and stone marls, and, from its effects upon the soil, is commonly classed among the animal manures: it does not dissolve with water as the other marls do.
Split into simpler sentences: Shell-marl is very different in its nature from clay and stone marls, and from its effects upon the soil. It is commonly classed among the animal manures: it does not dissolve with water as the other marls do.