Complex sentence: Leopoldo Nachbin (7 January 1922, Recife--3 April 1993, Rio de Janeiro) was a Brazilian mathematician who is best known for Nachbin's theorem.
Split into simpler sentences: Leopoldo Nachbin (7 January 1922--3 April 1993) was a Brazilian mathematician. Nachbin was born in Recife, and is best known for Nachbin's theorem.