Complex sentence: The city was of uncertain foundation, Greek or Illyrian: according to N.G.L. Hammond, it might have been founded by Pyrrhus I of Epirus or settlers from Apollonia, Ibid.
Split into simpler sentences: The city was of uncertain foundation, Greek or Illyrian. According to N.G.L. Hammond, it might have been founded by Pyrrhus I of Epirus or settlers from Apollonia, Ibid.