Complex sentence: When Tuvalu became independent in 1978, he was appointed as its first Prime Minister until his replacement on September 8,1981, as a result of his alleged involvement in an investment scandal.
Split into simpler sentences: When Tuvalu became independent in 1978, he was appointed as its first Prime Minister. He served in this office until his replacement on September 8,1981, as a result of his alleged involvement in an investment scandal.