sentences:  The company purchased the "Althea Gas", built in 2003, and the "VLGC Yuhsho", built in 1999.The company began further integrating the gas business into its business model by the purchase of second-hand liquefied petroleum gas carriers, operating in both the spot and short-term period markets.On 19 November 2010 SNG entered into a partnership with Sungas Holdings Ltd to become equal shareholders in Avance Gas Holding Ltd, which was previously wholly owned by SNG.