Complex sentence: For many years, he has concentrated on the work of Ezra Pound, and has also written about other poets, including Marianne Moore, Wallace Stevens, William Butler Yeats, Emily Dickinson, and Herman Melville.
Split into simpler sentences: For many years, he has been dedicated to a thorough study of the work of Ezra Pound. He has also focused on and written extensively about a fair number of other poets, including Marianne Moore, Wallace Stevens, William Butler Yeats, Emily Dickinson, and Herman Melville.