Complex sentence: When he first ran for the office of mayor of Surakarta, many doubted the ability of a man who had worked as a property and furniture businessman; however, after a year in office Jokowi had successfully led many progressive breakthroughs which became widely praised nationally.
Split into simpler sentences: When he first ran for the office of mayor of Surakarta, many doubted the ability of a man who had worked as a property and furniture businessman. However, after a year in office Jokowi had successfully led many progressive breakthroughs which became widely praised nationally.