Complex sentence: Eakins returned to the Pennsylvania Academy to teach in 1876 as a volunteer after the opening of the school's new Frank Furness designed building, became a salaried professor in 1878, and rose to director in 1882.
Split into simpler sentences: Eakins returned to the Pennsylvania Academy to teach in 1876 as a volunteer after the opening of the school's new Frank Furness designed building. He became a salaried professor in 1878, and rose to director in 1882.