Complex sentence: The Cardinals win in Game 3 not only put the Braves out of the NLCS for the first time since 1991 but it also made the Mets' run to the World Series much easier.
Split into simpler sentences: The Cardinals win in Game 3 put the Braves out of the NLCS for the first time since 1991. For the Mets, this made their run to the World Series much easier.