Complex sentence: Beard's definition of "neurasthenia" described a condition with symptoms of fatigue, anxiety, headache, impotence, neuralgia and depression which was particularly prone to Americans, earning it the nickname of "Americanitis" by William James.
Split into simpler sentences: Beard's definition of "neurasthenia" described a condition with symptoms of fatigue, anxiety, headache, impotence, neuralgia and depression. Americans were supposed to be particularly prone to neurasthenia, earning it the nickname of "Americanitis" by William James.