Complex sentence: Warao use canoes as their main form of transportation other modes (walking, "et cetera") are hampered by the hundreds of streams, rivulets, marshes, and high waters created by the Orinoco.
Split into simpler sentences: Warao use canoes as their main form of transportation. Other modes, such as walking, are hampered by the hundreds of streams, rivulets, marshes, and high waters created by the Orinoco.