Complex sentence: Founded in 2009,10:10 began by campaigning for a 10% reduction in carbon emissions in 2010, and has since broadened its approach to include a range of projects focused on carbon reduction and renewable energy.
Split into simpler sentences: Founded in 2009,10:10 began by campaigning for a 10% reduction in carbon emissions in 2010. The group now runs a range of projects focused on carbon reduction and renewable energy.