Complex sentence: Sir Philip Roy Hampton was the chairman of J Sainsbury plc, parent company of the Sainsbury's chain of supermarkets until he became the chairman of the Royal Bank of Scotland, on the 19th of January 2009.
Split into simpler sentences: Sir Philip Roy Hampton is the chairman of J Sainsbury plc, parent company of the Sainsbury's chain of supermarkets. He also became chairman of the Royal Bank of Scotland, on the 19th of January 2009.