Complex sentence: Cravaack went with 25 people to one of Oberstar's Minnesota offices asking for a meeting that day and when Oberstar did not come, Cravaack decided to challenge him in the November 2010 election.
Split into simpler sentences: Cravaack went with 25 people to one of Oberstar's Minnesota offices asking for a meeting that day. When Oberstar did not come, Cravaack decided to challenge him in the November 2010 election.