Original sentence: The lower of the two summits was first ascended on 10 July 1829 (Julian calendar) Сhilar Khachirov, a Circassian - Kabardian  guide for an Imperial Russian army scientific expedition led by General Emmanuel, and the higher (by about 40 m - 130 ft) in 1874 by an English expedition led by F
Edited sentence: The lower of the two summits was first ascended on 10 July 1829 (Julian calendar) by Сhilar Khachirov, a Circassian - Kabardian  guide for an Imperial Russian army scientific expedition led by General Emmanuel, and the higher (by about 40 m - 130 ft) in 1874 by an English expedition led by F