Original sentence: Born at San Vito al Tagliamento, Friuli,  Cassin was one of the leading mountaineers of the inter-war period; in all, Cassin has made a total of 2,500 ascents, of which over 100 have been first ascents
Edited sentence: Born at San Vito al Tagliamento, Friuli,  Cassin was one of the leading mountaineers of the inter-war period; in all, Cassin made a total of 2,500 ascents, of which over 100 were first ascents