Complex sentence: At February 1939, Ibárruri crossed the Pyrenees into France, with the remnants of the defeated Republican Popular Army, and was interned in the Argelès-sur-Mer concentration camp.
Split into simpler sentences: At February 1939, Ibárruri crossed the Pyrenees into France, with the remnants of the defeated Republican Popular Army. He was interned in the Argelès-sur-Mer concentration camp.