Complex sentence: Of these children, more than half are exposed to the worst forms of child labour such as work in hazardous environments, slavery, or other forms of forced labour, illicit activities such as drug trafficking and prostitution, as well as involvement in armed conflict.
Split into simpler sentences: Of these children, more than half are exposed to the worst forms of child labour. These worst forms of child labour include work in hazardous environments, slavery, or other forms of forced labour, illicit activities such as drug trafficking and prostitution, as well as involvement in armed conflict.