Complex sentence: Since the 1960s they also live along the lower Suriname River in villages constructed by the colonial government and Alcoa after approximately half of tribal territory was flooded for a hydroelectric project built to supply electricity for an aluminum smelter.
Split into simpler sentences: Since the 1960s, they also live along the lower Suriname River in villages constructed by the colonial government and Alcoa. They were relocated to allow flooding of approximately half their tribal territory for a hydroelectric project built to supply electricity for an aluminum smelter.