Complex sentence: The destruction date according to the Hebrew calendar was the 9th of Av, also known as Tisha B'Av, the Temple itself was located on the site of what today is the Dome of the Rock.
Split into simpler sentences: The destruction date according to the Hebrew calendar was the 9th of Av, also known as Tisha B'Av. The Temple itself was located on the site of what today is the Dome of the Rock.