Complex sentence: "Trapped in the Sky" is the pilot episode of "Thunderbirds", a British 1960s Supermarionation television series co-created by Gerry and Sylvia Anderson, which first aired on ATV Midlands on 30 September 1965.
Split into simpler sentences: Trapped in the Sky is the first episode of "Thunderbirds", a British 1960s Supermarionation television series. Written by co-creators Gerry and Sylvia Anderson, it was first broadcast on ATV Midlands on 30 September 1965.