Complex sentence: At the time WITI was founded, Leighton was President of Criterion Research, a research consulting firm for the high-tech industry based in California, which she founded in 1984, as well as chair of the Core Competency Database Project at Stanford University.
Split into simpler sentences: At the time WITI was founded, Leighton was President of Criterion Research, a research consulting firm for the high-tech industry based in California, which she founded in 1984. She was also chair of the Core Competency Database Project at Stanford University.