Complex sentence: He served as the editor of the children's magazines "Macaco" and "Macaquete", and contributed to "Gracia y Justicia", a periodical critical of Azaña.
Split into simpler sentences: He served as the editor of the children's magazines "Macaco" and "Macaquete". He also contributed to "Gracia y Justicia", a periodical critical of Azaña.