Complex sentence: A study found that using simple, inexpensive matter such as mulch, manure, and cover crop on the soil would help prevent erosion (Siebert, 1990), and this manure could also be used as a natural fertilizer for the plant.
Split into simpler sentences: A study found that using simple, inexpensive matter such as mulch, manure, and cover crop on the soil would help prevent erosion Siebert, S. (1990). Article DOI: 10.2307/3673539, and this manure could also be used as a natural fertilizer for the plant.