Complex sentence: The main beis medrash doubles as a synagogue where some neighborhood residents also pray on Shabbos, while the complex also includes a general neighborhood synagogue, which functions as Givat Shaul's main nusach Ashkenaz synagogue.
Split into simpler sentences: The main beis medrash doubles as a synagogue where some neighborhood residents also pray on Shabbat. The complex also includes a general neighborhood synagogue which functions as Givat Shaul's main nusach Ashkenaz synagogue.