Complex sentence: In 1911 she was awarded a U.S. pilot's certificate by the Aero Club of America, becoming the first woman to gain a pilot's license in the United States.in 1912 she became the first woman to fly across the English Channel.
Split into simpler sentences: In 1911 she was awarded a U.S. pilot's certificate by the Aero Club of America, becoming the first woman to gain a pilot's license in the United States. Less than a year later she became the first woman to fly across the English Channel.