Complex sentence: In November 2011, two A- 10s flew with the new wings fitted, and in September 2013, the USAF awarded Boeing a $212 million follow-on contract for 56 new wings, increasing the total ordered to 173.
Split into simpler sentences: In November 2011, two A- 10s flew with the new wings fitted. In September 2013, the USAF awarded Boeing a $212 million follow-on contract for 56 new wings, increasing the total ordered to 173.