Complex sentence: These molecules may influence the formation of network by FRCs; for example the chemokine CCL21 attaches to the surface of the FRCs through collagen and glycosaminoglycans.
Split into simpler sentences: These molecules may influence the formation of network by FRCs. E.g. chemokine CCL21 is attached to the surface of the FRCs through a collagen and glycosaminoglycans.