Complex sentence: CFTR not only allows chloride ions to be drawn from the cell and into the ASL, but it also regulates another channel called ENac, whichallows sodium ions to leave the ASL and enter the respiratory epithelium.
Split into simpler sentences: CFTR not only allows Chloride ions to be drawn from the cell and into the ASL, but it also regulates another channel called ENac. ENac allows sodium ions to leave the ASL and enter the respiratory epithelium.