Complex sentence: The length of the chains is easily manipulated by varying the degree of polymerization by changing the ratio of initiator to monomer while the grafting density, which is correlated to initiator surface density, can be adjusted as well.
Split into simpler sentences: The length of the chains is easily manipulated by varying the degree of polymerization by changing the ratio of initiator to monomer. The grafting density, which is correlated to initiator surface density, can be adjusted as well.