Simplify the following text for a Grade 9 native English-speaking person.
Original: The Temple in Jerusalem or Holy Temple ( Hebrew : ` '' `` , transliterated Bet HaMikdash what means literally `` The Holy House '' ) lied on the Temple Mount ( Har HaBayit ) in the old city of Jerusalem .
Simplified: The Temple in Jerusalem or Holy Temple , refers to one of a series of structures located on the Temple Mount in the Old City of Jerusalem .