Complex sentence: The series is produced by Proper Television, whose president, Guy O'Sullivan, was the director for the original "Britain's Worst Driver" series; as such, "Canada's Worst Driver" is considered to be the production company's flagship show.
Split into simpler sentences: The series is produced by Proper Television, whose president, Guy O'Sullivan, was the director of the original "Britain's Worst Driver" series. As such, "Canada's Worst Driver" is considered to be the production company's flagship show.