Complex sentence: On June 10,2008, Boren announced that he would not endorse the Democratic Party's presidential candidate, Barack Obama, but that he would vote for Obama at the party's convention in August.
Split into simpler sentences: On June 10,2008 Boren announced he will not endorse the Democratic Party's presidential candidate, Barack Obama. Boren said he will, however, vote for Obama at the party's convention in August.