Complex sentence: International Rivers' self-stated mission is to protect rivers and defend the rights of communities that depend on them, to actively oppose the unsustainable development model that dams perpetuate, and to promote viable solutions for meeting water, energy and flood-management needs.
Split into simpler sentences: International Rivers' stated aims are to protect rivers and defend the rights of communities that depend on them. It promotes alternative solutions for meeting water, energy and flood-management needs.