Complex sentence: Morris studied to become a Master of Wine concurrently with Jancis Robinson, MW, and with his sister Arabella Woodrow, MW represents the only pair of siblings to be Masters of Wine.
Split into simpler sentences: Morris studied to become a Master of Wine concurrently with Jancis Robinson, MW, and with his sister Arabella Woodrow, MW. They are the only pair of siblings to be Masters of Wine.