Complex sentence: On August 26,2010, the Patriots signed Gostkowski to a four-year extension, which added four years to his one-year tender contract; the extension gave him $14 million from 2011 to 2014, with $5 million guaranteed.
Split into simpler sentences: On August 26,2010, the Patriots signed Gostkowski to a four-year extension. While he will play 2010 on his tender contract, the extension will give him $14 million from 2011 to 2014, with $5 million guaranteed.