Complex sentence: The following are approximate tallies of current listings by county, based on entries in the National Register Information Database as of April 24,2008 and new weekly listings posted since then on the National Register of Historic Places web site.
Split into simpler sentences: The following are approximate tallies of current listings by county. These counts are based on entries in the National Register Information Database as of April 24,2008 and new weekly listings posted since then on the National Register of Historic Places web site.