Complex sentence: These two monomers under normal physiological conditions, are by-products of various metabolic pathways in the body, and therefore there is very minimal systemic toxicity associated with using PLGA for drug delivery or biomaterial applications.
Split into simpler sentences: These two monomers under normal physiological conditions, are by-products of various metabolic pathways in the body. Since the body effectively deals with the two monomers, there is very minimal systemic toxicity associated with using PLGA for drug delivery or biomaterial applications.