Complex sentence: Nitric oxide (nitrogen monoxide, NO), is a natural free radical used in signal transduction in both plants and animals, for example, in vasodilation by causing the smooth muscle of blood vessels to relax.
Split into simpler sentences: Nitric oxide (nitrogen monoxide, NO), is a natural free radical used in signal transduction in both plants and animals. It is used, for example, in vasodilation, causing the smooth muscle of blood vessels to relax.