Complex sentence: Fatu Huku is a dry island compared with most high islands in Polynesia, receiving only an estimated to of precipitation annually, the altitude insufficient to capture much of the water in the predominately easterly winds.
Split into simpler sentences: Fatu Huku is a dry island compared with most high islands in Polynesia, receiving only an estimated to of precipitation annually. The altitude is insufficient to capture much of the water from the predominately easterly winds.