Complex sentence: Smithfield is an area on the northside of Dublin centering around a public square, formerly an open market, now officially called Smithfield Plaza, but known locally as Smithfield Square or Smithfield Market.
Split into simpler sentences: Smithfield is an area on the northside of Dublin. It's focal point is a public square, formerly an open market, now officially called Smithfield Plaza, but known locally as Smithfield Square or Smithfield Market.