Complex sentence: The vast majority (97%) of academic staff hosted at ENS belongs to external academic institutions such as the CNRS and Parisian universities, this scientific turnover mechanism allows ENS to benefit of a continuous inflow of experts in all fields.
Split into simpler sentences: The vast majority (97%) of academic staff hosted at ENS belongs to external academic institutions such as the CNRS and Parisian universities. This scientific turnover mechanism allows ENS to benefit of a continuous inflow of experts in all fields.