Complex sentence: By this approach it is possible to only lower the value of the resulting resistor, it is therefore necessary to shift the manufacturing tolerances so the lowest-value typically made is equal or larger than the desired value.
Split into simpler sentences: By this approach, it is possible only to lower the value of the resulting resistor. It is therefore necessary to shift the manufacturing tolerances so that the lowest-value typically made is equal to or larger than the desired value.