Complex sentence: Midland is part of the greater Adventist Education System operated by the Seventh-day Adventist Church-North American Division, Office of Education which began oversight of elementary and secondary education in 1872.
Split into simpler sentences: Midland is part of the greater Adventist education system operated by the Seventh-day Adventist Church. It is under the direction of the Office of Education of the North American Division of Seventh-day Adventists, which began oversight of elementary and secondary education in 1872.