Complex sentence: The temperature at which austenite transforms to martensite is generally referred to as the transformation temperature--more specifically, martensite begins to form at the so-called M s temperature, and the temperature at which it is complete is called the M f temperature.
Split into simpler sentences: The temperature at which austenite transforms to martensite is generally referred to as the transformation temperature. More specifically, martensite begins to form at the so-called M s temperature, and the temperature at which the transformation is complete is called the M f temperature.