Complex sentence: ABG Gas Supply was established and secured loans from Citigroup, Credit Suisse First Boston, and Deutsche Bank to buy natural gas at market prices to then sell the gas at a discount to Dynegy.
Split into simpler sentences: ABG Gas Supply was established and it secured loans from Citigroup, Credit Suisse First Boston, and Deutsche Bank. It would buy natural gas at market prices to then sell it at a discount to Dynegy.