Complex sentence: For example, the vectors (3,0,0,1) and (1,2,0,1) add to (4,2,0,2), so (56) (126) is a square.
Split into simpler sentences: For example, the vectors (3,0,0,1) and (1,2,0,1) add to (4,2,0,2). This tells us that (56) (126) is a square.