Complex sentence: In 1908, "Washington" was finally brought back indoors when Congress transferred it to the Smithsonian Castle, where it remained until 1964, when it was moved to the new Museum of History and Technology (now the National Museum of American History).
Split into simpler sentences: In 1908, "Washington" was finally brought back indoors when Congress transferred it to the Smithsonian Institution. It remained at the Smithsonian Castle until 1964, when it was moved to the new Museum of History and Technology (now the National Museum of American History).