Complex sentence: The company has a long history of serving royalty, as well as stars and celebrities; then Prince of Wales Edward VII once called Cartier "Joaillier des Rois, Roi des Joailliers" (Jeweller of the Kings, King of Jewellers).
Split into simpler sentences: The company has a long history of serving royalty, as well as stars and celebrities. One Prince of Wales called Cartier "Joaillier des Rois, Roi des Joailliers" (Jeweller of the Kings, King of Jewellers).