Complex sentence: Leaves take between one and two years to break down into rich humic matter with a smell reminiscent of ancient woodland, and, while not high in nutrient content, leafmold is an excellent bulky and fibrous soil conditioner.
Split into simpler sentences: Leaves take between one and two years to break down into rich humic matter with a smell reminiscent of ancient woodland. While not high in nutrient content, leaf mold is an excellent bulky and fibrous soil conditioner.