Complex sentence: It was derived from a Provençal expression for the technical skill required for poetry writing that had already been used by Ralph Waldo Emerson and E. S. Dallas and, in inverted form, by Thomas Carlyle (see dismal science).
Split into simpler sentences: It was derived from a Provençal expression for the technical skill required for poetry-writing. It had already been used by Emerson and E. S. Dallas and in inverted form by Thomas Carlyle (see dismal science).