Complex sentence: The average debt in 2005 was $17,233 and now U.S. student loan debt has climbed to $27,253 a 58% increase in the past 7 years.
Split into simpler sentences: The average debt in 2005 was $17,233 and now U.S. student loan debt has climbed to $27,253. This is a 58% increase in the past 7 years.