Complex sentence: The Ivy is a restaurant very popular with celebrities, people from the arts and media and theatregoers and is situated in West Street, near Cambridge Circus in London and opposite the Ambassadors and St Martins theatres.
Split into simpler sentences: The Ivy is a restaurant which is very popular with celebrities, people from the arts and media and theatregoers. It is situated in West Street, near Cambridge Circus in London and opposite the Ambassadors and St Martins theatres.