Complex sentence: Schools are generally divided into elementary or primary schools (Kindergarten to Grade 8), and secondary, or high school (Grades 9 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 schools (Kindergarten to Grade 8), and secondary, or high school (Grades 9 to 12). However, in many areas middle schools are also provided and in some schools, particularly in rural areas, the elementary and middle levels can be combined into one school.