Complex sentence: At the urging of Erik Erikson, in 1963 Coles became affiliated with University Health Services at Harvard as a research psychiatrist, and gradually he began teaching in the Harvard Medical School, eventually becoming Professor of Psychiatry and Medical Humanities in 1977.
Split into simpler sentences: At the urging of Erik Erikson, in 1963 Coles became affiliated with the University Health Services at Harvard as a research psychiatrist. Gradually, he began teaching in the Harvard Medical School, eventually becoming Professor of Psychiatry and Medical Humanities in 1977.