sentence: In my opinion , the discovery and harnessing of the atom and its energy and the corresponding invention of nuclear weapons have been the most significant factors of change in our lifetime , if not , perhaps , in several lifetimes .
modified: In my opinion , the discovery and harness of atom and its energy and the corresponding invention of nuclear weapons have been the most significant factors of change in our lifetime , if not , perhaps , in several lifetimes .
transformation: NOUN:NUM, DET