Complex sentence: An empirical performance and programmability study has been performed by researchers, in which the authors claim that achieving high performance with Xeon Phi still needs help from programmers and that merely relying on compilers with traditional programming models is still far from reality.
Split into simpler sentences: An empirical performance and programmability study has been performed by researchers. The authors claim that to achieve high performance Xeon Phi still needs help from programmers and that merely relying on compilers with traditional programming models is still far from reality.