Complex sentence: Roney was played by Canadian actor Cec Linder, John Stratton played Captain Potter, and Christine Finn played the other main character, Barbara Judd; she later voiced various characters in the popular 1960s children's television series "Thunderbirds".
Split into simpler sentences: Roney was played by Canadian actor Cec Linder, John Stratton played Captain Potter, and Christine Finn played the other main character, Barbara Judd. She went on to provide the voices for various characters in the popular 1960s children's television series "Thunderbirds".