Complex sentence: Certain neurological and respiratory ill health effects have been linked anecdotally to exposure to contaminated bleed air on commercial and military aircraft--the alleged associated long-term illness is known as Aerotoxic Syndrome.
Split into simpler sentences: Certain neurological and respiratory ill health effects have been linked to exposure to contaminated bleed air on commercial and military aircraft. The associated long-term illness is known as Aerotoxic Syndrome.