Simplify the following text for a Grade 7 native English-speaking person.
Original: Gaius Julius Caesar ( 13 July 100 BC â `` 15 March 44 BC ) was a military commander , politician and author at the end of the Roman Republic .
Simplified: Gaius Julius Caesar ( 13 July 100 BC â `` 15 March 44 BC ) was a Roman general and statesman .