Complex sentence: The High Street and Dublin Street form the crossed streets at the top of this square, and are lined by the most significant buildings: the Town Hall and Dancing Room (built in 1805), and the Coaching Inn.
Split into simpler sentences: The High Street and Dublin Street form the cross street at the top of the square, lined by the most significant buildings. These are the Town Hall and Dancing Room built in 1805; and the Coaching Inn.