This task is about translating a given English language sentence to Spanish.

When this was going on during the Warlord era - especially as we go back into the early 1920s - in 1921 in particular - Sun Yat-sen hasn't given up.
Durante este periodo, mientras todo esto estaba sucediendo, si volvemos a poner la mirada a principios de la década de 1920 - en particular en el año 1921 - Sun Yat-sen no se había dado por vencido.