Complex sentence: Water bodies, such as estuaries, can also have a region of transition, and these boundaries are characterized by the differences in heights of the macrophytes or plant species present in the areas as this will distinguish the two areas' accessibility to light.
Split into simpler sentences: Water bodies, such as estuaries, can also have a region of transition. These boundaries are characterized by the differences in height of the plant species or macrophytes present in the areas as this will distinguish the two areas' accessibility to light.