Complex sentence: The amount the masker raises the threshold of the signal is much less in off frequency masking, but it does have some masking effect because some of the masker overlaps into the auditory filter of the signal (figure E), (Moore 1998).
Split into simpler sentences: The amount the masker raises the threshold of the signal is much less in off frequency masking. You can see from figure E however, that it does have some masking effect because some of the masker overlaps into the auditory filter of the signal (Moore 1998).