Two decades ago, Richard Kinder helped start a boom in reorganizing large U.S. companies so they’re exempt from corporate income tax. Kinder plans to buy up two companies he controls, known as master limited partnerships, for a combined $44 billion, consolidating his oil and natural gas pipeline empire under a single, taxable corporation known as Kinder Morgan Inc. The change will lower investor payouts, leaving heft to beat rivals on new projects or buy them up, he said.