sentences:  Initially there was no doubt that this particle was an elementary particle.However, a few years later this hyperon, along with the proton, the neutron, the pion and other hadrons had all lost their status as elementary particles when they turned out to be complex particles consisting of quarks and antiquarks.Wang remained affiliated with the Joint Institute for Nuclear Research even after returning to China, serving as its deputy director from 1958 until 1960.