Complex sentence: Caspian is again portrayed by Barnes for Walden's sequel,', this time with a beard to show that time has passed; throughout that time, he has grown and matured into a wise young man.
Split into simpler sentences: Caspian is again portrayed by Barnes for Walden's sequel,', this time with a beard to show that time has passed. He is portrayed as having grown and matured into a wise young man.