Complex sentence: Electrically neutral particles, such as the neutron, are not identical to their antiparticle, since'ordinary' particles are made out of quarks and their antiparticles out of antiquarks.
Split into simpler sentences: Electrically neutral particles, such as the neutron, are not identical to their antiparticle. In the example of the neutron, the'ordinary' particle is made out of quarks and the antiparticle out of antiquarks.