Complex sentence: In the UK, the opera was first presented at the Royal Opera House, Covent Garden on 19 May 1894 while the US premiere was at the Metropolitan Opera, New York, on 4 February 1895.
Split into simpler sentences: In the UK, the opera was first presented at the Royal Opera House, Covent Garden on 19 May 1894. The US premiere was at the Metropolitan Opera, New York, on 4 February 1895.