Simplify the following text for a Grade 8 native English-speaking person.
Original: Jean-Jacques Rousseau ( 28 June 1712 - 2 July 1778 ) was a major Genevan philosopher , writer , and composer of 18th-century Romanticism .
Simplified: Jean-Jacques Rousseau , ( 1712 â `` July 2 , 1778 ) was a famous French speaking philosopher . He was born in Geneva , Switzerland and always described himself as being Genevan .