Complex sentence: The Ark in a synagogue (Jewish house of worship) is known as the Aron Hakodesh amongst Ashkenazim and as Hekhál amongst most Sefardim.
Split into simpler sentences: The Ark in a synagogue (Jewish house of worship) is known in Hebrew as Aron Kodesh. By the the Ashkenazim as the Aron Hakodesh and as Hekhál amongst most Sefardim.