Complex sentence: In 1847 it became part of Belgium's Musée Royal d'Armures, d'Antiquités et d'Ethnologie (Museum of armour, antiquity and ethnology), now named the Royal Museums for Art and History.
Split into simpler sentences: In 1847 it became part of Belgium's Musée Royal d'Armures, d'Antiquités et d'Ethnologie (Museum of armour, antiquity and ethnology). Both museums are now part of the Royal Museums for Art and History.