Complex sentence: The realtors planned for a road to come through from Virginia Beach, Virginia, to allow access to the lots, however these plans were abandoned in 1973 when the Back Bay National Wildlife Refuge south of Sandbridge was closed to all vehicular traffic, except by permit.
Split into simpler sentences: The realtors planned for a road to come through from Virginia Beach, Virginia to allow access to the lots. However, these plans were abandoned in 1973 when the federal wildlife refuge south of Sandbridge was closed to all vehicular traffic, except by permit.