Complex sentence: The Hanoi Opera House is considered to be a typical French colonial architectural monument in Vietnam and is also a small-scale replica of the Palais Garnier, the older of Paris's two opera houses.
Split into simpler sentences: The Hanoi Opera House is considered as a typical French colonial architecture monument in Vietnam. It is regarded as a small-scale replica of the Palais Garnier, the older of Paris's two opera houses.