Complex sentence: Bass was a pilar in the movement to bring a more rigorous quantitative approach to solving marketing promblems and his research contributions over a 52-year career in academics and private consulting work range widely over a broad set of marketing issues.
Split into simpler sentences: Bass was a pilar in the effort to bring a more rigorous quantitative approach to the solution of marketing promblems. His research contributions over a 52-year career in academics and private consulting range widely over a broad set of marketing issues.