Complex sentence: He begins to use his by-now vast knowledge of the day's events to help as many people around town as possible, and uses the time to learn, among other things, how to play the piano, to sculpt ice, and speak French.
Split into simpler sentences: He begins to use his by-now vast experience of the day to help as many people around town as possible. He uses the time to learn, among other things, how to play the piano, to sculpt ice, and speak French.