Complex sentence: Dying cells and foreign organisms are consumed by cells other than the "professional" phagocytes, which cells include epithelial cells, endothelial cells, fibroblasts, and mesenchymal cells.
Split into simpler sentences: Dying cells and foreign organisms are consumed by cells other than the "professional" phagocytes. These cells include epithelial cells, endothelial cells, fibroblasts, and mesenchymal cells.