Complex sentence: The pollution of bodies of water with excess nitrate from the atmosphere may lead to hypoxia as the compound promotes rapid algae growth which then results in reduced oxygen water levels, making it difficult for marine species to survive.
Split into simpler sentences: The pollution of bodies of water with excess nitrate from the atmosphere may lead to hypoxia. The compound promotes rapid algae growth, which then results in reduced oxygen water levels making it difficult for marine species to survive.