Complex sentence: The year after his 1935 graduation from Middlebury, he received his master's degree from the University of Chicago, and in 1939 began teaching at the University of Omaha, which he left in 1942 when he took his Ph.D from Ohio State University.
Split into simpler sentences: The year after his 1935 graduation from Middlebury, he received his master's degree from the University of Chicago, and in 1939 began teaching at the University of Omaha. He left Omaha in 1942 when he took his Ph.D from Ohio State University.