Complex sentence: After Zeus deemed this issue beneath him and left, Hermes accompanied Aphrodite, Ares, Athena, Demeter, and Hestia to the Underworld and the Cavern of Souls, where Gaia has housed the souls of women who have been unjustly killed by men.
Split into simpler sentences: After Zeus deemed this issue beneath him and left, Hermes accompanied Aphrodite, Ares, Athena, Demeter, and Hestia to the Underworld where the Cavern of Souls is. The Cavern of Souls is where Gaia has housed the souls of women who have been unjustly killed by men.