Original sentence: The US Army rates the relative effectiveness of ammonium nitrate, compared to TNT, as 0.42.The blast is listed in the Guinness Book of World Records under largest single explosive detonation.This conversion factor makes the blast the equivalent of 1.7kilotons of TNT
Edited sentence: Although comparing explosions is difficult, this is probably the largest artificial non-nuclear explosion in history.The blast is listed in the Guinness Book of World Records under largest single explosive detonation, although Minor Scale would appear to be larger