Complex sentence: On June 27,2008, the largest study of bird genetics was published which overturns several hypothesized relationships, and will likely necessitate a wholesale restructuring of the avian phylogenetic tree.
Split into simpler sentences: On June 27,2008, the largest study of bird genetics was published. It overturns several hypothesized relationships, and will likely necessitate a wholesale restructuring of the avian phylogenetic tree.