Complex sentence: Among prominent currently practicing neuropathologists are Mark Cohen, MD at Case Western Reserve University, Richard Prayson, MD at the Cleveland Clinic, and John E. Donahue, M.D. at Brown University.
Split into simpler sentences: Among prominent currently practicing neuropathologists is Mark Cohen, MD at Case Western Reserve University. However, one who is still actively practicing is John E. Donahue, M.D. at Brown University.