Complex sentence: There is a substantially wide "normal" spectrum for behavior at this stage of child development, and standard tests only establish risk level (low, moderate, high), and do not purport to be a life sentence.
Split into simpler sentences: There is a substantially wide "normal" spectrum for behavior at this stage of child development. Standard tests for children of this age only establish risk level (low, moderate, high), and do not purport to be a life sentence.