The breakup of Royal Dutch Shell’s and Saudi Aramco’s giant U.S. refining joint venture draws a line under an often rocky relationship and allows Aramco to accelerate an ambitious public offering and Shell to push ahead with a large asset sale. The two energy giants’ plan to dissolve Motiva Enterprises after a near 20-year partnership leaves both with fully-owned refineries and gas stations in the United States. Refineries have recently enjoyed a boom time as a near 70 percent plunge in oil prices since mid-2014 spurred demand for gasoline from around the world, helping many oil companies recover revenue lost from oil production. “The deal gives both companies a lot of flexibility,” said Jason Gammel, an analyst at Jefferies. Saudi Arabia’s oil champion Aramco, which will own the largest U.S. refinery in Port Arthur, Texas […]