Complex sentence: Planck's blackbody mechanism is based on the blackbody surface electrons oscillating a diathermic medium that motion forms light waves that energy is represented with the frequency v of Planck's energy element.
Split into simpler sentences: Planck's blackbody mechanism is based on the blackbody surface electrons oscillating a diathermic medium. The motion of Planck's diathermic medium forms light waves that energy is represented with the frequency v of Planck's energy element.