Complex sentence: In the films he was created with computer-generated imagery and though Marton Csokas is credited with his voice; how much of his voice made it into the final, digitally altered voice is open to debate.
Split into simpler sentences: In the films he was created with computer-generated imagery. Although Marton Csokas is credited with his voice, how much of his voice made it into the final, digitally altered voice is open to debate.