Complex sentence: But 23 years later in 1989 the Convention on the Rights of Children was adopted that helped to reduce the exploitation of children, safe working environments, and working toward to the goal of ending the most problematic forms of child labour.
Split into simpler sentences: But 23 years later in 1989 the Convention on the Rights of Children was adopted and helped to reduce the exploitation of children, and demanded safe working environments. All working towards the goal of ending the most problematic forms of child labour.