Original: He became highly critical of the involvement of Confederación Nacional del Trabajo (CNT) members in the Popular Front government, expressing his views in an open letter to Federica Montseny (Anarchist minister for Health).
Simplified: After months he became highly critical of the involvement of Confederación Nacional del Trabajo (CNT) members in the Popular Front government, and he sent a letter to Federica Montseny (Anarchist minister for Healt in the government against fascism).