Complex sentence: Most nickel carvers of the 1980s to mid- 1990s are regarded by collectors as mediocre at best, but circa 1995, Ron Landis, an engraver in Arkansas, began creating superior quality carvings.
Split into simpler sentences: Most nickel carvers of the 1980s to mid 1990s are regarded by collectors as mediocre at best. But circa 1995, Ron Landis, an engraver in Arkansas, began creating superior quality carvings.