Complex sentence: The carbamate insecticide propoxur is highly toxic to bed bugs, but it has potential toxicity to children exposed to it, and the US Environmental Protection Agency (EPA) has been reluctant to approve it for indoor use.
Split into simpler sentences: The carbamate insecticide propoxur is highly toxic to bed bugs. It has potential toxicity to children exposed to it; the US Environmental Protection Agency (EPA) has been reluctant to approve it for indoor use.