Complex sentence: The Particle Data Group is an international collaboration of particle physicists that compiles and reanalyzes publish results related to the properties of particles and fundamental interactions, reviews theoretical results that are phenomologically relevant, and also related fields such as cosmology.
Split into simpler sentences: The Particle Data Group is an international collaboration of particle physicists that compiles and reanalyzes published results related to the properties of particles and fundamental interactions. It also publishes reviews of theoretical results that are phenomologically relevant, including those in related fields such as cosmology.