Simplify the following text for a Grade 6 native English-speaking person.
Original: Xenophanes of Colophon ( Ancient Greek : ; c. 570 â `` c. 475 BC ) was a Greek philosopher , theologian , poet , and social and religious critic .
Simplified: Xenophanes of Colophon , c. 570 â `` c. 475 BC , was a Greek philosopher , poet , and social and religious critic .