Complex sentence: The concept of glass ceilings was originally introduced outside of print media at the National Press Club in July of 1979 at a Conference of the Women's Institute for Freedom of the Press by Katherine Lawrence of Hewlett-Packard.
Split into simpler sentences: The concept of glass ceilings was originally introduced outside of print media at the National Press Club in July of 1979. This was at a Conference of the Women's Institute for Freedom of the Press by Katherine Lawrence of Hewlett-Packard.