please help explain.

the relationship between the simple contract benchmark and the shares undelying it is compared to the relationship between the complex contract and the shares that would be used to hedge it over the range of prices of the underlying security represented by an increase in price by one standard deviation and a decrease in price by one standard deviation.

if the proportionate difference between the change in value of the complex contract and the change in value of its hedge within the standard deviation range is equal to or less than the corresponding change for the simple contract benchmark and the shares underlying it, then the complex contract tracks its hedge more closely than the simple benchmark contract tracks its hedge(i.e, the shares underlying it)