Simplify the following text for a Grade 9 native English-speaking person.
Original: Caesar made Cassius a legate , employing him in the North Africa , but Cassius refused to join in the fight against Cato and Scipio in Africa , choosing instead to retire to Rome .
Simplified: However , Cassius refused to join in the fight against Cato and Scipio in Africa , choosing instead to retire to Rome .