Complex sentence: Some pesticides can remain in the environment for prolonged periods of time for example most people in the United States still have detectable levels of (DDT) in their bodies even though it was banned in the US in 1972.
Split into simpler sentences: Some pesticides can remain in the environment for prolonged periods of time. For example, most people in the United States still have detectable levels of (DDT) in their bodies even though it was banned in the US in 1972.