Complex sentence: Perseus, Io, Suleiman, Draco, and his remaining men Solon, Eusebius, and Ixas cross into the Underworld and enter Medusa's temple lair while Io remains outside.
Split into simpler sentences: Perseus, Io, Suleiman, Draco, and his remaining men, Solon, Eusebius, and Ixas, cross into the Underworld. The men enter Medusa's temple lair while Io remains outside.