Complex sentence: The main deity inside the temple sanctorum gives "nijaroopa darshan" (holy appearance in true form) for only 12 hours in a year i.e. on Akshaya Tritiya day, the rest of the time the deity is covered with Sandalwood paste.
Split into simpler sentences: The main deity inside the temple sanctum gives "nijaroopa darshan" (holy appearance in true form) for only 12 hours in a year. On Akshaya Tritiya day, the rest of the time the deity is covered with Sandalwood paste.