Simplify the following text for a Grade 7 native English-speaking person.
Original: 546 BC ) , was a pre-Socratic Greek philosopher from Miletus in Asia Minor , and one of the Seven Sages of Greece .
Simplified: Thales of Miletus ( ; , ThalÄ `` s ; 624 BC â `` c. 546 BC ) was a pre-Socratic Greek philosopher from Miletus in Asia Minor , and one of the Seven Sages of Greece .