Complex sentence: The notion of an ecological cycle (or recycling) in nature has a historical foothold in the writings of Charles Darwin in reference to the decomposition actions of earthworms he talked about "the continued movement of the particles of earth".
Split into simpler sentences: The notion of an ecological cycle (or recycling) in nature has a historical foothold in the writings of Charles Darwin in reference to the decomposition actions of earthworms. Darwin wrote about "the continued movement of the particles of earth".