Complex sentence: Alan and co. escape confinement and contact the Tracys, who regain control of "Thunderbird 5" and head off to stop the Hood, while the teenagers, Lady Penelope, and Parker fly to London in "Thunderbird 1".
Split into simpler sentences: Alan and co. escape confinement and contact the Tracys who regain control of "Thunderbird 5". While the adults head off to stop the Hood, the teenagers, Lady Penelope, and Parker fly to London in "Thunderbird 1".