Complex sentence: The piano recital by the character of Igor Sladek was performed by English pianist Robert Docker, while the hands seen in the live-action close-up shots of Joe playing the piano belonged to the son of series composer Barry Gray, Simon.
Split into simpler sentences: The piano recital by the character of Igor Sladek was performed by English pianist Robert Docker. The hands seen in the live-action close-up shots of Joe's hands playing the piano belonged to the son of composer Barry Gray, Simon.