Complex sentence: The prize was awarded "for pioneering experimental contributions to lepton physics", half to Perl "for the discovery of the tau lepton" while Reines received his share "for the detection of the neutrino".
Split into simpler sentences: The prize was awarded "for pioneering experimental contributions to lepton physics". Perl received half "for the discovery of the tau lepton" while Reines received his share "for the detection of the neutrino".