Complex sentence: It was eventually finished under Tsar Ferdiand, to whom the Bulgarian state awarded it after that, by Swiss architect Hermann Mayer and Bulgarian architect Lazarov and renamed "Euxinograd" in 1893 on the insistence of Knyaginya Marie Louise, Ferdinand's first wife.
Split into simpler sentences: It was eventually finished under Tsar Ferdiand, to whom the Bulgarian state awarded it after that, by Swiss architect Hermann Mayer and Bulgarian architect Lazarov. The palace was renamed "Euxinograd" in 1893 on the insistence of Knyaginya Marie Louise, Ferdinand's first wife.