It has the soil quality, growing season, and moisture supply needed to produce economically sustained high yields of crops when 
(It; has; the soil quality, growing season, and moisture supply needed) (the soil quality, growing season, and moisture supply; needed; to produce economically sustained high yields of crops when)
It the soil quality, growing season, and moisture supply
has needed
the soil quality, growing season, and moisture supply needed
to produce economically sustained high yields of crops when