Complex sentence: It was the first Sentai series to be adapted into an installment of the American "Power Rangers" series--footage from all 50 episodes was extensively used for the first season of "Mighty Morphin Power Rangers".
Split into simpler sentences: It was the first Sentai series to be adapted into an installment of the American "Power Rangers" series. Footage from all 50 episodes was extensively used for the first season of "Mighty Morphin Power Rangers".