Complex sentence: The Sabbath remained on the seventh day in the early Christian church, as it continues to be today in Catholicism, Orthodoxy, and Oriental Orthodoxy.
Split into simpler sentences: The Sabbath remained on the seventh day in the early Christian church. To this day, the Sabbath continues to coincide with the Hebrew Sabbath timing in the church calendars in Catholicism, Orthodoxy, and Oriental Orthodoxy.