Complex sentence: Bumpy torus designs were an area of active research in the 1960s and 70s, notably with the ELMO (ELectro Magnetic Orbit) Bumpy Torus at the Oak Ridge National Laboratory, but these demonstrated problems and most research on the concept has ended.
Split into simpler sentences: Bumpy torus designs were an area of active research in the 1960s and 70s, notably with the ELMO (ELectro Magnetic Orbit) Bumpy Torus at the Oak Ridge National Laboratory. These demonstrated problems and most research on the concept has ended.