Complex sentence: They are fully aware of the fact that the "-er" ending already expresses the concept of "more", neverthless, native speakers' constant deviance from the norm shows an overwhelming need for expression of greater emphasis than the current idiom provides.
Split into simpler sentences: They are fully aware of the fact that the "-er" ending already expresses the concept of "more". Neverthless, native speakers' constant deviance from the norm shows an overwhelming need for expression of greater emphasis than the current idiom provides.