Complex sentence: The Fifth Council of Constantinople was a series of councils held in Constantinople in 1341,1347 and 1351, which exonerated St. Gregory Palamas' hesychastic theology and condemned the rationalistic philosophy of Barlaam of Calabria.
Split into simpler sentences: The Fifth Council of Constantinople was a series of councils held in Constantinople in 1341,1347 and 1351, which considered charges against the hesychastic theology of St. Gregory Palamas. The final result of these councils was to exonerater Palamas and condemn the rationalistic philosophy of Barlaam of Calabria.