Complex sentence: The former town hall, now the royal palace was built by Jacob van Campen, who took control of the construction project in 1648, as the Town Hall for the City of Amsterdam, and was built on 13,659 wooden piles and cost 8,5 million gulden.
Split into simpler sentences: The former town hall, now the royal palace was built by Jacob van Campen. It was built on 13,659 wooden piles and cost 8,5 million gulden.