Complex sentence: In 1999, Carrick held the position of Distinguished PostGraduate Professor of Clinical Neurology at Logan College of Chiropractic, in Chesterfield, near St. Louis, Missouri and concurrently held the position Professor Emeritus of Neurology, Parker University in Dallas, Texas.
Split into simpler sentences: In 1999, Carrick held the position of Distinguished PostGraduate Professor of Clinical Neurology at Logan College of Chiropractic, in Chesterfield, near St. Louis, Missouri. He concurrently held the position Professor Emeritus of Neurology, Parker University in Dallas, Texas.