Complex sentence: Thus you already know, as long as you remember that these each have a unique sound, for example always the sound of "get," never of "gem," and always the sound of "so," never of "rose".
Split into simpler sentences: Thus you already know, as long as you remember that these each have a single sound. For example, always represents the sound of "get," never of "gem," and always the sound of "so," never of "rose".