Complex sentence: In physics, Planck units are physical units of measurement defined exclusively in terms of five universal physical constants listed below, in such a manner that these five physical constants take on the numerical value of "1" when expressed in terms of these units.
Split into simpler sentences: In physics, Planck units are physical units of measurement defined exclusively in terms of five universal physical constants listed below. In this manner these five physical constants take on the numerical value of "1" when expressed in terms of these units.