Complex sentence: The peptidoglycans bind to the NOD1 receptor on intestinal epithelial cells, which subsequently express CCL20 and B-defensin 3.
Split into simpler sentences: The peptidoglycans bind to the NOD1 receptor on intestinal epithelial cells. As a result, the intestinal epithelial cells express chemokine ligand 20 (CCL20) and Beta defensin 3.