Complex sentence: If built, the Third Temple (: "Beit haMikdash haShlishi" lit. (The) House, the Holy, the Third) would be the third Jewish temple in Jerusalem after Solomon's Temple and the rebuilt Second Temple.
Split into simpler sentences: If built, the Third Temple (: "Beit haMikdash haShlishi" lit. "(The) House, the Holy, the Third") would be the third Jewish temple in Jerusalem. This temple would be the third central religious space for Jews after Solomon's Temple and the rebuilt Second Temple.