Simplify the following text for a Grade 8 native English-speaking person.
Original: It was billed as a battle of Rangers managerial staff , with ex-boss Dick Advocaat , currently the manager of Zenit , pitted against current boss Walter Smith , who has had two stints as manager of Rangers , with both completing the Scottish domestic treble ; Smith in 1993 , Advocaat in 1999 .
Simplified: It was called a battle of Rangers coaching staff , with ex-boss Dick Advocaat , currently the manager of Zenit against current boss Walter Smith . Smith has had two times as manager of Rangers .