Complex sentence: In his radio work, he acted in a number of network soap operas, and sees those experiences as being especially valuable, as skill in using one's voice is important for aspiring actors, and regrets that the same avenues are no longer open to them.
Split into simpler sentences: In his radio work, he acted in a number of network soap operas. He looks back on those experiences as being especially valuable, as skill in using one's voice is important for aspiring actors, and regrets that the same avenues are no longer open to them.