Original: He worked for two communist publications: the daily Die Rote Fahne and the weekly Arbeiter-Illustrierte-Zeitung (AIZ), the latter of which published the works for which Heartfield is best remembered.
Simplified: Heartfield started to work for two communist publications: the daily Die Rote Fahne (The Red Flag)and the weekly Arbeiter-Illustrierte-Zeitung (AIZ)(Workers' Illustrated Newspaper).