Complex sentence: He is voiced by Mark Hamill, who portrayed Luke Skywalker in the films, for the portrayal Filoni recorded Hamill to reading his line using multiple inflections, each portraying different emotions, and then blended all together into the version heard within the episode.
Split into simpler sentences: He is voiced by Mark Hamill, who portrayed Luke Skywalker in the films. For the portrayal, Filoni recorded Hamill to reading his line using multiple inflections, each portraying different emotions, and then blended all together into the version heard within the episode.