Simplify the following text for a Grade 10 native English-speaking person.
Original: Korchnoi , however , still had a vital part to play in the next ( 1984 ) Candidates ' cycle , although he never reached the highest pinnacle again . He was matched to play the young Soviet Garry Kasparov who at the time was battling against a Soviet Chess Federation that was clearly in favor of Anatoly Karpov .
Simplified: Korchnoihad a vital part to play in the next ( 1984 ) Candidates ' cycle , where he was due to play the young Soviet Garry Kasparov .