Complex sentence: The original ceiling was conceived in 1912 by Warren with his friend, French portrait artist Paul César Helleu, the mural was the creation of James Monroe Hewlett and Charles Basing of Hewlett-Bassing Studio with Paul Helleu consulting.
Split into simpler sentences: The original ceiling was conceived in 1912 by Warren with his friend, French portrait artist Paul César Helleu. The mural was the creation of James Monroe Hewlett and Charles Basing of Hewlett-Bassing Studio, with Paul Helleu consulting.