Complex sentence: The kingdom at that time forbade any but the Royal residences to use roofing tiles, but nevertheless Prince Rajamanthri built himself a replica palace with two sprawling stories of terracotta tiles.
Split into simpler sentences: The kingdom at that time forbid everyone, but the Royal residences, to use roofing tiles. However Prince Rajamanthri built himself a replica palace with two sprawling stories of terracotta tiles.