Complex sentence: The Oscar, which was believed to have been lost by Welles, was rediscovered in 1994, was owned by the Dax Foundation, a Los Angeles based charity, and was sold at auction in 2011 by an anonymous seller to an anonymous buyer for $861,542.
Split into simpler sentences: The Oscar, believed to have been lost by Welles, was rediscovered in 1994. Owned by the Dax Foundation, a Los Angeles based charity, it was sold at auction in 2011 by an anonymous seller to an anonymous buyer for $861,542.