Complex sentence: New since 2012 is the harvesting of grapes and the production of wines by "Vinha Maria Chaves", a new vineyard created 10 years ago, which is about 25 hectares big and which is located just beneath the crater.
Split into simpler sentences: New since 2012 is the harvesting of grapes for the production of wines by "Vinha Maria Chaves", a new vineyard created during the last 10 years. The vineyard is about 25 hectares big and is located just beneath the crater.