Complex sentence: In 2010 he visited slums in Nairobi, Kenya to see a Christian Aid project providing clean water and sanitation to thousands of people, during his stay he met the residents and helped to clean out sewage works.
Split into simpler sentences: In 2010 he visited slums in Nairobi, Kenya to see a Christian Aid project providing clean water and sanitation to thousands of people. During his stay he met the residents and helped to clean out sewage works.