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Of course, a more complex version of the sentence is "Richard Axel is known to be a great aficionado of opera and attended Joan Sutherland's debut performance at New York's Metropolitan Opera with his high school friend Jerold Brenowitz, who later became a heart surgeon".<unk> Of course, a more complex version of the sentence is "Richard Axel is known to be a great aficionado of opera and attended Joan Sutherland's debut performance at New York's Metropolitan Opera with his high school friend Jerold Brenowitz, who later became a heart surgeon".<unk>