Complex sentence: The Duke of York's Picturehouse, dating from 1910, It was opened by Mrs Violet Melnotte-Wyatt, is the country's oldest purpose-built cinema and was Brightons first Electric Bioscope, which still operates as an arthouse cinema.
Split into simpler sentences: The Duke of York's Picturehouse, dating from 1910, was opened by Mrs Violet Melnotte-Wyatt. It is the country's oldest purpose-built cinema and was Brightons first Electric Bioscope, which still operates as an arthouse cinema.