Complex sentence: The building below the New Brighton Tower, which was to contain the ballroom, was constructed by Peters and Sons of Rochdale, was a four-storey red-brick construction with arched windows and hexagonal, copper-domed turrets.
Split into simpler sentences: The building below the New Brighton Tower, which was to contain the ballroom, was constructed by Peters and Sons of Rochdale. It was a four-storey red-brick building with arched windows and hexagonal, copper-domed turrets.