Complex sentence: Despite posting the second-best regular-season record in the entire league in 1990--91, the Blues were upset in the second round of the playoffs to the Minnesota North Stars, a defeat that was symbolic of St. Louis' playoff struggles.
Split into simpler sentences: Despite posting the second-best regular-season record in the entire league in 1990--91, the Blues were upset in the second round of the playoffs to the Minnesota North Stars. A defeat that was symbolic of St. Louis' playoff struggles.