Complex sentence: Their most successful season was 1995 when they managed to grab the Russian Premier League champions title, after several years of Spartak Moscow domination having previously won a silver medal for the second place in 1992 and 1996.
Split into simpler sentences: Their most successful season was 1995 when they managed to win the Russian Premier League champions title after several years of domination by Spartak Moscow. The team had previously won a silver medal for second place in 1992 and 1996.