Complex sentence: One of her sisters, the Archduchess Maria Amalia, was also in love with a minor prince, Charles of Zweibrücken, but was forcibly married off to Ferdinand of Parma, remained estranged from her mother for the rest of the Dowager Empress' life.
Split into simpler sentences: One of her sisters, the Archduchess Maria Amalia, was also in love with a minor prince, Charles of Zweibrücken, but was forcibly married off to Ferdinand of Parma. She remained estranged from her mother for the rest of the Dowager Empress' life.