Complex sentence: The instrument is capable of a range of at least two octaves, and more if well crafted and in the hands of an experienced player; they can be fashioned to any length, suitable bamboo permitting, with longer instruments having their frequency range shifted proportionally lower.
Split into simpler sentences: The instrument is capable of a range of at least two octaves, and more if well crafted and in the hands of an experienced player. Hocchiku can be fashioned to any length, suitable bamboo permitting, with longer instruments having their frequency range shifted proportionally lower.