Complex sentence: When in pH 7 or below, the pH riboregulator element (PRE) exists in an inactive'N' state; in alkali conditions, RNA polymerase controls the folding of this ncRNA to its'H' active form.
Split into simpler sentences: When in pH 7 or below, the pH riboregulator element (PRE) exists in an inactive'N' state. In alkali conditions, RNA polymerase controls the folding of this ncRNA to its'H' active form.