Complex sentence: On 11 September 2010, he suffered a knee tendon injury and required surgery, which kept him out of action until mid-January, when he played 60 minutes in the reserves, scoring twice.
Split into simpler sentences: On 11 September 2010, he suffered a knee tendon injury and required surgery. This kept him out of action until mid-January, when he played 60 minutes in the reserves, scoring twice.