Complex sentence: R "n" + "m" → R "m" be a continuously differentiable function, and let R "n" + "m" have coordinates (x, y).
Split into simpler sentences: R "n" + "m" → R "m" be a continuously differentiable function. R n + m → R m be a continuously differentiable function, and let R "n" + "m" have coordinates (x, y).