Complex sentence: In root-tubers, there are no nodes and internodes or reduced leaves; one end called the proximal end, which is end that was attached to the old plant, has crown tissue that produces buds that grow into stems and foliage.
Split into simpler sentences: In root-tubers, there are no nodes and internodes or reduced leaves. Root tubers have one end called the proximal end, which is the end that was attached to the old plant; this end has crown tissue that produces buds which grow into new stems and foliage.