Complex sentence: Seven annual Biblical festivals, called "miqra" ("called assembly ") in Hebrew and"High Sabbath" in English and serving as supplemental testimonies to Sabbath, are specified in the books of Exodus and Deuteronomy and do not necessarily fall on Sabbath.
Split into simpler sentences: Seven annual Biblical festivals, called by the name "miqra" ("called assembly ") in Hebrew and"High Sabbath" in English, serve as supplemental testimonies to the plan of Sabbath. These are recorded in the books of Exodus and Deuteronomy and do not necessarily occur on Sabbath.