Complex sentence: The obelisk, the George IV Testimonial on Queen's Road is located close to the Carlisle Pier, and commemorates the arrival of the King in Dunleary in 1823 to commemorate the change of the name of the town to Kingstown, a name which remained until 1821.
Split into simpler sentences: The obelisk,'The George IV Testimonial' on Queen's Road is located close to the Carlisle Pier. It commemorates the visit of the King in Dunleary in 1823 and records the change of the name of the town to Kingstown, a name which remained until 1821.