Complex sentence: The phylogenetic relationships among the main groups of arthropods have been the subject of considerable research and dispute for many years, but a consensus has emerged from about 2010 onwards, based on both morphological and molecular evidence.
Split into simpler sentences: The phylogenetic relationships among the main groups of arthropods have been the subject of considerable research and dispute for many years. A consensus emerged from about 2010 onwards, based on both morphological and molecular evidence.