Complex sentence: She, her sister Estusia, and other women smuggled gunpowder out of the Union munitions factory and passed it from insider to insider until it reached the "Sonderkommando".
Split into simpler sentences: She, her sister Estusia, and other women smuggled gunpowder out of the Union munitions factory. They were then able to pass it from insider to insider until it reached the "Sonderkommando".