Complex sentence: Although many of the lines for which Myres designed the buildings have been closed, many of his buildings survive as private residences; the goods shed at Singleton in West Sussex was declared a Grade II Listed building in May 2013.
Split into simpler sentences: Although many of the lines for which Myres designed the buildings have been closed, many of his buildings survive as private residences. Several of the buildings designed by him are listed buildings, including the goods shed at Singleton in West Sussex which was declared Grade II in May 2013.