Wendy Cope is one of those extraordinary people whose talents, so far at least, has not quite crossed the Atlantic Ocean. She’s a major celebrity in England, where a poet can still be a major celebrity. Her first book, “Making Cocoa for Kingsley Amis,” sold more than 200,000 copies, an absurd number for a collection of poems. Her poetry is sparse, funny, heartbreaking, and in the spirit of a hero, Emily Dickinson, always more complicated than its effortless flow.