Complex sentence: The chemical subsidiary maintained its viability and continues returning profits to its parent company in Bartlesville as of 2013, having merged with Chevron in 2000, to form the Chevron Phillips Chemical Company, a 50-50 venture splitting costs and profit shares equally.
Split into simpler sentences: The chemical subsidiary maintained its viability and continues returning profits to its parent company from Bartlesville. As of 2014, having merged with Chevron in 2000, Chevron Phillips Chemical Company operates as a 50-50 venture; splitting costs and profit shares equally.