Complex sentence: The 12th arrondissement hosts Opéra Bastille, the second largest opera house in Paris which have been inaugurated in 1989, on the 200th anniversary of the storming of the Bastille.
Split into simpler sentences: The 12th arrondissement contains the Opéra Bastille, the second largest opera house in Paris. It was inaugurated in 1989, on the 200th anniversary of the storming of the Bastille.