Complex sentence: Its top lot was a hand-painted Russian urn by the imperial porcelain factory of Czar Nicholas I, at St. Petersburg; estimated at $150,000 to $200,000, it sold for $494,500.
Split into simpler sentences: Its top lot was a hand-painted Russian urn by Czar Nicholas I's imperial porcelain factory at St. Petersburg. Estimated at $150,000 to $200,000, it sold for $494,500.