Complex sentence: In Hesiod's "Theogony", he was the son of Erebus and Nyx and brother of Hemera, both noted in passing in Cicero's "De Natura deorum", but Hyginus Pref mentioned Khaos as his parent.
Split into simpler sentences: In Hesiod's "Theogony", he was the son of Erebus and Nyx and brother of Hemera. Both were noted in passing in Cicero's "De Natura deorum", but Hyginus Pref mentioned Khaos as his parent.