Complex sentence: The Dünamünde Action was a operation launched by the Nazi German occupying force in Biķernieki forest, near Riga, Latvia to murder Jews whom they had recently deported to Latvia from Germany, Austria, Bohemia and Moravia.
Split into simpler sentences: The Dünamünde Action was an operation launched by the Nazi German occupying force in Biķernieki forest, near Riga, Latvia. Its objective was to execute Jews who had recently been deported to Latvia from Germany, Austria, Bohemia and Moravia.