Original sentence: , a total of 26 people have summitted all 14 peaks undisputed.Messner had summitted each of the 14 peaks without the aid of supplemental oxygen.This feat was not repeated until nine years later by Erhard Loretan in 1995.This is an extremely hazardous feat; at least four people have died while in pursuit of this goal
Edited sentence: Although Messner went on all the eight-thousanders without the aid of supplemental oxygen, Kukuczka while supporting oxygen used during ascent of Mount Everest but Kukuczka won the Crown of Himalaya in a much better style (he set up 9 new roads and 4 tops ascent in the winter)