Complex sentence: The tubers are gnarly and uneven, typically 7.5--10 cm long and 3--5 cm thick, and vaguely resembling ginger root, with a crisp texture when raw; they vary in color from pale brown to white, red or purple.
Split into simpler sentences: The tubers are elongated and uneven, typically 7.5--10 cm long and 3--5 cm thick, and vaguely resembling ginger root, with a crisp texture when raw. They vary in color from pale brown to white, red or purple.