Complex sentence: The building was built by the Duke of Saxe in 1862, and donated in 1910 to the Fundação Nacional do Índio, state agency led by Cândido Rondon from its inception in 1910, with the purpose of establishing a preserved area of Brazil's indigenous culture.
Split into simpler sentences: The building was built by the Duke of Saxe in 1862. In 1910, it was donated to the Fundação Nacional do Índio--a state agency that sought to establish a preserved area of Brazil's indigenous culture.