Complex sentence: From 1956 to 1960 Dr. Schmidt's research was devoted to cardiac electrophysiology and pharmacology, and from 1960 to 1970 he studied the mechanisms and functions of presynaptic inhibition in the spinal cord, and since 1965 he has studied somatosympathetic interactions.
Split into simpler sentences: From 1956 to 1960 Schmidt's research was devoted to cardiac electrophysiology and pharmacology. From 1960 to 1970 he studied the mechanisms and functions of presynaptic inhibition in the spinal cord, and since 1965 he has studied somatosympathetic interactions.