Complex sentence: Danial Synagogue is the only Ashkenazi themed synagogue in Iran that is located in 30 Tir street (Formerly known as Ghavam Al saltaneh street) in Tehran that was mainly employed during the time of second world war by the Polish Jewish refugees.
Split into simpler sentences: Danial Synagogue is the only Ashkenazi-themed synagogue in Iran that is located at 30 Tir Street (formerly known as Ghavam Al Saltaneh Street), in Tehran. It was mainly employed during the time of Second World War by the Polish Jewish refugees.