Complex sentence: In 1938, at the age of 13, and due to a loss of vision in her right eye, frightened by a thunderstorm, La Troienne ran into a tree.
Split into simpler sentences: In 1938, at the age of 13, La Troienne was badly frightened by a thunderstorm. Startled and confused, but worse, half blind due to a loss of vision in her right eye, she ran straight into a tree.