Complex sentence: Müller glia, or Müller cells, are glial cells found in the vertebrate retina, which serve as support cells for the neurons of the retina as all glial cells do.
Split into simpler sentences: Müller glia, or Müller cells, are a type of retinal glial cells. They are found in the vertebrate retina, which serve as support cells for the neurons of the retina as all glial cells do.