Original sentence: He made many difficult ascents in the Alps, including the Central Pillar of Frêney on Mont Blanc with Don Whillans, Chris Bonington and Jan Dlugosz in 1961 and the North Face of the Eiger, with Bonington in 1962
Edited sentence: He made many difficult ascents in the Alps, including the Central Pillar of Frêney on Mont Blanc with Don Whillans, Chris Bonington and Jan Dlugosz in 1961 and the first British ascent of the North Face of the Eiger, with Bonington in 1962