Complex sentence: Apparently, Pytheas said that tides ended at the "sacred promontory" ("Ieron akrōtērion", or Sagres Point), and from there to Gades is said to be 5 days' sail.
Split into simpler sentences: Apparently, Pytheas said that tides ended at the "sacred promontory" ("Ieron akrōtērion"), meaning Sagres Point. From there to Gades is said to be 5 days' sail.