Original sentence: As such, Error Level Analysis is a method used by hobbyists.Worse still, the actual determination of the level of compression artifacts in a given segment of the data is subjective and the determination of whether editing has occurred is therefore not robust
Edited sentence: According to Jens Kriese, Error Level Analysis is a method used by hobbyists.Further, the actual determination of the level of compression artifacts in a given segment of the data is subjective and the determination of whether editing has occurred is therefore not robust