Complex sentence: Prince Albert of Saxe-Coburg and Gotha is the only spouse of a British queen to have held it: it was awarded to him in 1857 by his wife, Queen Victoria (reigned 1837--1901).
Split into simpler sentences: Prince Albert of Saxe-Coburg and Gotha is the only spouse of a British queen ever to have held it. It was awarded to him in 1857 by his wife, Queen Victoria (reigned 1837--1901).