Complex sentence: The Malvar station has not been built yet, and the additional feasibility study was only been concluded on December, 2009 and the designing is still undergoing as it was not included in the original design and no foundations for the station has been dug yet.
Split into simpler sentences: The Malvar station has not been built yet, and the additional feasibility study was only been concluded on December, 2009. In addition, the designing is still ongoing as it was not included in the original design and no foundations for the station has been dug yet.