Complex sentence: On June 17,1912, she decided to make a test flight around duck; visibility was poor, and, on takeoff, one wing struck a tree limb, and the plane tumbled to the ground, pinning her beneath the wreckage.
Split into simpler sentences: On June 17,1912, she decided to make a test flight around dusk. Visibility was poor, and, on takeoff, one wing struck a tree limb, and the plane tumbled to the ground, pinning her beneath the wreckage.