Complex sentence: Leech, having drunk the immortality potion, convinces a rat kept by Spittle to take him to the sewers and takes his brother's name and title as his own, "Jupiter, Lord of All".
Split into simpler sentences: Leech, having drunk the immortality potion, convinces a rat kept by Spittle to take him to the sewers. Leech takes his brother's name and title as his own, "Jupiter, Lord of All".