Complex sentence: Other accounts make Briareus or Aegaeon one of the assailants of Olympus, who, after his defeat, was buried under Mount Aetna (Callimachus, "Hymn to Delos", 141).
Split into simpler sentences: Other accounts make Briareus (or Aegaeon) one of the assailants of Olympus. After his defeat, he was buried under Mount Aetna (Callimachus, "Hymn to Delos", 141).