(CMAAS) Planting Shelterbelts At one time, the main reason farmers planted field shelterbelts was to protect their soil from wind erosion.
(farmers; planted; field shelterbelts) (the main reason farmers planted field shelterbelts; was; to protect their soil from wind erosion)
farmers the main reason farmers planted field shelterbelts
planted was
field shelterbelts
to protect their soil from wind erosion