Complex sentence: A black body in thermal equilibrium emits electromagnetic radiation called black-body radiation with a spectrum and intensity that is independent of the nature of the body and characterized only by its temperature (shown in the figure to the right).
Split into simpler sentences: A black body that has a spatially and temporally uniform internal and surface temperature emits electromagnetic radiation called black-body radiation. The radiation has a spectrum of intensity that is universal for black bodies and is determined by its temperature alone (shown in the figure to the right).