Complex sentence: Upon the death of his father in 1828 and his becoming Viscount Melbourne, he moved to the House of Lords, but when the Whigs came to power under Lord Grey in November 1830 he became Home Secretary in the new government.
Split into simpler sentences: Upon the death of his father in 1828 and his becoming Viscount Melbourne, he moved to the House of Lords. When the Whigs came to power under Lord Grey in November 1830 he became Home Secretary in the new government.