Complex sentence: The existence of the dynasty may have been vindicated in January 2014, when the tomb of the previously unknown pharaoh Seneb Kay was discovered in the southern part of Abydos, an area called "Anubis Mountain" in ancient times.
Split into simpler sentences: The existence of the dynasty was confirmed in January 2014, when the tomb of the previously unknown pharaoh Seneb Kay was discovered in Abydos. The royal necropolis of the Abydos Dynasty was found in the southern part of Abydos, in an area called Anubis Mountain in ancient times.