Complex sentence: It held the reserves of European countries and key documents from Western history; for example, it held the Crown of St. Stephen, part of the Hungarian crown jewels, given to American soldiers to prevent them from falling into Soviet hands.
Split into simpler sentences: It held the reserves of European countries and key documents from Western history. For example, it held the Crown of St. Stephen, part of the Hungarian crown jewels, given to American soldiers to prevent them from falling into Soviet hands.