Complex sentence: The pipeline is set to cross through the country's largest wetland which can threaten the watershed, fishermen and hunters who have used this land for a source of food and water supply of the indigenous people of United Houma Nation.
Split into simpler sentences: The pipeline is set to cross through the country's largest wetland. This poses possible threats to the environmental health of the watershed, and consequently the fishermen and hunters who have used this land as a source of food and water supply for the indigenous people of United Houma Nation.