Complex sentence: Nearly all countries throughout the world, except the United States and Canada, follow this type of curricular the United States, topics are usually separated so that one year a student focuses entirely on algebra, the next year entirely on geometry, and so on.
Split into simpler sentences: Nearly all countries throughout the world, except the United States and Canada, follow this type of curriculum. In the United States, topics are usually separated so that one year a student focuses entirely on algebra, the next year entirely on geometry, and so on.