Complex sentence: Derby dissolved Parliament, and the ensuing general election resulted in modest Tory gains, but not enough to control the Commons, and when Parliament assembled, Derby's Government was defeated by 13 votes on an amendment to the Address from the Throne.
Split into simpler sentences: Derby dissolved Parliament, and the ensuing general election resulted in modest Tory gains, but not enough to control the Commons. When Parliament assembled, Derby's Government was defeated by 13 votes on an amendment to the Address from the Throne.