Complex sentence: The Pittsburgh Pirates season resulted in the team winnning their first National League East title, with a record of 89-73, five games over the Chicago Cubs, but lost the NLCS to the NL West Champion Cincinnati Reds, three games to none.
Split into simpler sentences: The Pittsburgh Pirates season resulted in the team winnning their first National League East title with a record of 89-73, five games ahead of the Chicago Cubs. However, they lost the NLCS to the NL West Champion Cincinnati Reds, three games to none.