Complex sentence: His interview with Obama was on the Senator's first day as a Senator, and Obama was uninterested in Favreau's résumé, questioning him instead on what motivated him to work in politics, and what his theory of writing was.
Split into simpler sentences: His interview with Obama was on the Senator's first day. Uninterested in Favreau's résumé, Obama instead questioned Favreau on what motivated him to work in politics, and what his theory of writing was.