Complex sentence: When inflation is ignored, the painting broke the record price for an art work sold at auction which a previous auction record was set in February 2010, by Alberto Giacometti's "L'Homme qui marche I" at $104.3 million.
Split into simpler sentences: When inflation is ignored, the painting broke the record price for an art work sold at auction. The previous auction record was set in February 2010 by Alberto Giacometti's "L'Homme qui marche I", which sold for $104.3 million.