Complex sentence: Testing is underway in Ameland for a three-year field testing until 2010 were 20% hydrogen is added to the local CNG distribution net, the appliances involved are kitchen stoves, condensing boilers and micro-CHP boilers.
Split into simpler sentences: Testing is underway in Ameland for a three-year field testing until 2010 where 20% hydrogen is added to the local CNG distribution net. The appliances involved are kitchen stoves, condensing boilers and micro-CHP boilers.