Complex sentence: Clenbuterol is reported to induce unintended side effects on humans, such as increased heart rate, muscular tremors, headache, nausea, fever, and chills, while the US FDA has concluded these side effects to be unacceptable.
Split into simpler sentences: Clenbuterol is reported to induce unintended side effects on humans, such as increased heart rate, muscular tremors, headache, nausea, fever, and chills. The US FDA has concluded these side effects to be unacceptable.