Complex sentence: Only 29 pieces of the original order remain in existence from the 231 first commissioned, 4 of which are in The Raleigh DeGeer Amyx Collection, 2 of those 4 being lozenge-shaped serving dishes.
Split into simpler sentences: Only 29 pieces of the original order remain in existence from the 231 first commissioned. Four of these are in the Raleigh DeGeer Amyx Collection; two of the four are lozenge-shaped serving dishes.