Simplify the following text for a Grade 8 native English-speaking person.
Original: This decision has paid off as Warner has put up great numbers in leading the Cardinals to a 9-7 regular season record in the 2008 season and the NFC West Division championship , the Cardinals ' first division title since 1975 , when the team played in St. Louis , and the club 's first playoff berth since 1998 .
Simplified: This was good enough to win NFC West Division , the Cardinals ' first division title since 1975 , when the team played in St. Louis , Missouri . Whisenhunt 's second season was also the Cardinals ' first time in the playoffs since 1998 .