Complex sentence: Schools are generally divided into elementary or primary schools (Kindergarten to Grade 7), and secondary, or high school (Grades 8 to 12); in some schools, particularly in rural areas, the elementary and middle levels can be combined into one school.
Split into simpler sentences: Schools are generally divided into Elementary or Primary school (Kindergarten to Grade 7), and Secondary, or High School (Grade 8 to 12). In some schools, particularly in rural areas, the elementary and middle levels can be combined into one school.