Complex sentence: The rate of release of the iodine in the PVP-I is heavily dependent on the hydrogel composition: it increases with more CMC/PVA and decreases with more gelatin.
Split into simpler sentences: The rate of release of the iodine in the PVP-I is heavily dependent on the hydrogel composition. The release rate increases with more CMC/PVA and decreases with more gelatin.