Complex sentence: From 1973 to 1981, Tolbert was an assistant professor in the department of History at UCSD, teaching UCSD's first courses in African American History and initiating an MA program in Social and Ethnic History.
Split into simpler sentences: From 1973 to 1981, Tolbert was an assistant professor in the department of History at UCSD. He taught UCSD's first courses in African American History and initiated an MA program in Social and Ethnic History.