Complex sentence: John Paul Stevens (born April 20,1920) served as an Associate Justice of the Supreme Court of the United States from December 19,1975 until his retirement on June 29,2010.
Split into simpler sentences: John Paul Stevens (born April 20,1920) served as an Associate Justice of the Supreme Court of the United States. He joined the Supreme Court in December 1975, serving until his retirement on June 29,2010.