Complex sentence: At the University of Oklahoma, Dr. Carpenter taught, performed research in his areas of expertise, and directed the graduate work of 26 Doctor of Philosophy, 21 Master of Science, and 3 Master of Natural Science students.
Split into simpler sentences: At the University of Oklahoma, Dr. Carpenter taught and did research in his areas of expertise. He directed the graduate work of 26 Doctor of Philosophy, 21 Master of Science, and 3 Master of Natural Science students.