Complex sentence: Rafael Nadal was the five-time defending champion, but Novak Djokovic defeated him in the quarterfinals; this was just his second career defeat here and ended his record win streak of 39 matches.
Split into simpler sentences: Rafael Nadal was the five-time defending champion, but Novak Djokovic defeated him in the quarterfinals. This was just Nadal's second career defeat here and ended his record win streak of 39 matches.