Complex sentence: Copies with the pasted-on cover intact above the butcher image are known as "second state" or "pasteovers"; today, pasteover covers that have remained unpeeled are also becoming increasingly rare and valuable.
Split into simpler sentences: Copies with the pasted-on cover intact above the butcher image are known as "second state" or "pasteovers". Today, pasteover covers that have remained unpeeled are also becoming increasingly rare and valuable.