Complex sentence: As it was the first game show broadcast on commercial television in the UK (and the BBC did not at that point offer monetary prizes on its game shows), it was also by default the first British game show to offer cash prizes.
Split into simpler sentences: As it was the first game show broadcasted on commercial television in the UK (and the BBC), it did not offer monetary prizes on its game shows at that point. It was also by default the first British game show to offer cash prizes.