Complex sentence: Pierre Charles Lemonnier (November 23,1715-May 31,1799), French astronomer, was born in Paris, where his father was professor of philosophy at the college d'Harcourt.
Split into simpler sentences: Pierre Charles Lemonnier (November 23,1715-May 31,1799) was a French astronomer. He was born in Paris, where his father was professor of philosophy at the college d'Harcourt.