Complex sentence: Eleanor of Portugal, Empress of the Holy Roman Empire (;) (18 September 1434--3 September 1467), was a Portuguese "infanta" (princess), daughter of King Edward of Portugal and his wife Leonor of Aragon.
Split into simpler sentences: Eleanor of Portugal (18 September 1434--3 September 1467) was Empress of the Holy Roman Empire. She was a Portuguese "infanta" (princess), daughter of King Edward of Portugal and his wife Leonor of Aragon.