Complex sentence: A few pieces were retrieved where they had been hidden in the Seine, including two of the bees, but record of the treasure now exists only in the fine engravings made at the time of its discovery, and in some reproductions made for the Habsburgs.
Split into simpler sentences: A few pieces were retrieved where they had been hidden in the Seine, including two of the bees. The record of the treasure, however, now exists only in the fine engravings made at the time of its discovery, and in some reproductions made for the Habsburgs.