Complex sentence: The House of Vasa was the Royal House of Sweden (1523-1654) and also of Poland (1587-1668), origined from a noble family in Uppland of which several members had high offices during the 15th century.
Split into simpler sentences: The House of Vasa was the Royal House of Sweden 1523-1654 and of Poland 1587-1668. It origined from a noble family in Uppland of which several members had high offices during the 15th century.