Complex sentence: Symptoms of mild acute poisoning include lightheadedness, confusion, headache, vertigo, and flu-like effects; larger exposures can lead to significant toxicity of the central nervous system and heart, and death.
Split into simpler sentences: Symptoms of mild acute poisoning include lightheadedness, confusion, headache, feeling like the world is spinning, and flu-like effects. Larger exposures can lead to toxicity of the central nervous system and heart, and death.