Complex sentence: De Laroche's flight is often cited as the first by a woman in a powered heavier-than-air craft; there is evidence that two other women, P. Van Pottelsberghe and Thérèse Peltier had flown the previous year with Henri Farman and Delagrange respectively.
Split into simpler sentences: De Laroche's flight is often cited as the first by a woman in a powered heavier-than-air craft. However there is evidence to suggest two other women, P. Van Pottelsberghe and Thérèse Peltier had flown the previous year with Henri Farman and Delagrange respectively.