Complex sentence: Although Parsons entered Harvard through the Economics Department, he never aimed at becoming an economist; all of his activities and his basic intellectual interest propelled him toward sociology, but no Sociology Department existed in the first years at the time at Harvard.
Split into simpler sentences: Although Parsons entered Harvard through the Economics Department, he never wanted to be an economist. All of his activities and his basic intellectual interest propelled him toward sociology, but no Sociology Department existed in his first years at Harvard.