Complex sentence: Produced during the second stage of enamel calcification, aka the maturation stage, ameloblasts produce matrix and enamel at the rate of 4 micrometers per day; however every fourth day there is a change in development.
Split into simpler sentences: Produced during the second stage of enamel calcification, aka maturation stage. Ameloblast produces matrix and enamel at 4mm per day however every fourth day there is a change in development.