Complex sentence: Asymptotic freedom implies that in high-energy scattering the quarks move within nucleons, such as the neutron and proton, essentially as free, non-interacting particles, and it allows physicists to calculate the cross sections of various events in particle physics reliably using parton techniques.
Split into simpler sentences: Asymptotic freedom implies that in high-energy scattering the quarks move within nucleons, such as the neutron and proton, mostly as free non-interacting particles. It allows physicists to calculate the cross sections of various events in particle physics reliably using parton techniques.