Complex sentence: His heir was Princess Victoria, only daughter of Prince Edward Augustus, Duke of Kent; but because Hanover was ruled under Salic Law since the times of the Holy Roman Empire, she could not inherit the Hanoverian throne.
Split into simpler sentences: His heir was Princess Victoria, only daughter of Prince Edward Augustus, Duke of Kent. Because Hanover was ruled under Salic Law since the times of the Holy Roman Empire, Victoria could not inherit the Hanoverian throne.