Complex sentence: However, one recent, proposed vein of research in 2008 called for the construction of Beowulf computer clusters to simulate galaxy-sized particle accelerators having energy outputs sufficient to enable investigators to simulate the probing of Planck length scales (P. Doyle, University of Maryland).
Split into simpler sentences: However, one recent proposed vein of research in 2008 called for constructing Beowulf computer clusters to enable investigators to model particle accelerators having energy output equivalent to that of entire galaxies. Such models might be sufficient to simulate the probing of Planck length scales (P. Doyle, University of Maryland).