Complex sentence: When these pieces are evaluated by auction experts they conclude these imitations aren't worth even for the normal engraving price and when consumers approached vendors to have their money returned found it hard and unapproachable.
Split into simpler sentences: When these pieces are evaluated by auction experts the experts conclude that these imitations aren't worth even for the normal engraving price. When consumers approached vendors to have their money returned found it hard and unapproachable.