Complex sentence: In January 2013, Ronaldo became Save the Children's new Global Artist Ambassador, in which he hopes to help fight child hunger and obesity On March 2013, Ronaldo agreed to be the ambassador for The Mangrove Care Forum in Indonesia.
Split into simpler sentences: In January 2013, Ronaldo became Save the Children's new Global Artist Ambassador, in which he hopes to help fight child hunger and obesity. In March 2013, Ronaldo agreed to be the ambassador for The Mangrove Care Forum in Indonesia.