Complex sentence: In the fall of 1940 two other massive inflows of refugees arrived in Portugal from Luxembourg, accompanied by the President of the Jewish Community of Luxembourg, Mr. A. Nussbaum.
Split into simpler sentences: In the fall of 1940 two other massive inflows arrived to Portugal. Two groups of refugees from Luxembourg arrived to Portugal in the fall of 1940, accompanied by the President of the Jewish Community of Luxembourg, Mr. A. Nussbaum.