Complex sentence: Jean Emile Humbert (1771-1839) was a Dutch lieutenant-colonel who can be credited with rediscovering ancient Carthage and as an agent for the Dutch government procured vital parts of the collection of the National Museum of Antiquities in Leiden.
Split into simpler sentences: Jean Emile Humbert (1771-1839) was a Dutch lieutenant-colonel who can be credited with rediscovering ancient Carthage. As an agent for the Dutch government he procured vital parts of the collection of the National Museum of Antiquities in Leiden.