Complex sentence: Seattle Sounders FC won the match by defeating the Columbus Crew 2--1 in front of a sellout crowd of 31,311, the largest crowd ever to attend a U.S. Open Cup final.
Split into simpler sentences: Seattle Sounders FC won the match by defeating the Columbus Crew 2--1. The match was played in front of a sellout crowd of 31,311, the largest crowd ever to attend a U.S. Open Cup final.