Complex sentence: Her astronomy research has been published extensively in peer-reviewed journals:, the arXiv service lists 61 publications, mostly in the categories of either Astrophysics of Galaxies or Cosmology.
Split into simpler sentences: Her astronomy research has been published extensively in peer-reviewed journals:, the arXiv service lists 61 publications. Most of them are in the topics of either Astrophysics of Galaxies or Cosmology.