Complex sentence: Bob Ely, also known as Robert Moulton-Ely (born 1958), is an American entrepreneur and former investment banker, challenging President Barack Obama in several primaries for the Democratic Party's 2012 presidential nomination.
Split into simpler sentences: Bob Ely, also known as Robert Moulton-Ely (born 1958), is an American entrepreneur and former investment banker. He challenged President Barack Obama in several primaries for the Democratic Party's 2012 presidential nomination.