Complex sentence: The United States claimed Funafuti, Nukufetau, Nukulaelae and Niulakita under the Guano Islands Act of 1856, this claim was renounced under the 1983 treaty of friendship between Tuvalu and the United States.
Split into simpler sentences: The United States claimed Funafuti, Nukufetau, Nukulaelae and Niulakita under the Guano Islands Act of 1856. This claim was renounced under the 1983 treaty of friendship between Tuvalu and the United States.