Complex sentence: When the Spanish civil war broke out, Southworth reviewed books on the conflict for the "Washington Post", his articles bringing him to the notice of the Spanish republic's ambassador, who asked him to work for the Spanish information bureau.
Split into simpler sentences: When the Spanish civil war broke out, Southworth reviewed books on the conflict for the "Washington Post". His articles brought him to the notice of the Spanish republic's ambassador, who asked him to work for the Spanish information bureau.