Complex sentence: Córdova worked at the Space Astronomy and Astrophysics Group at the Los Alamos National Laboratory from 1979 to 1989, where she also served as Deputy Group Leader, and headed the Department of Astronomy and Astrophysics at Pennsylvania State University from 1989 to 1993.
Split into simpler sentences: Córdova worked at the Space Astronomy and Astrophysics Group at the Los Alamos National Laboratory from 1979 to 1989, where she also served as Deputy Group Leader. She headed the Department of Astronomy and Astrophysics at Pennsylvania State University from 1989 to 1993.