Complex sentence: The film is a reboot and reimagining of the "Power Rangers" franchise, and the first film since', featuring most of the main characters of "Mighty Morphin Power Rangers" portrayed by a new cast.
Split into simpler sentences: The film is a reboot and reimaging of the "Power Rangers" franchise, and the first film since'. It is a reboot and reimagining of the franchise that features most of the main characters of "Mighty Morphin Power Rangers" portrayed by a new cast.