Complex sentence: In 2014, he worked on flushing solar-powered toilets that worked like a miniature waste-treatment plant, based on nanofiltration and anaerobic digestion to implement in places where water supply and sanitation are scarce.
Split into simpler sentences: In 2014, he worked on flushing solar-powered toilets that worked like a miniature waste-treatment plant. This technology based on nanofiltration and anaerobic digestion was to be implemented in places where water supply and sanitation are scarce.