Complex sentence: With the "country party" in disarray, George Melville, 1st Earl of Melville, David Leslie-Melville, 3rd Earl of Leven and even Lord Shaftesbury, leader of the opposition to Charles's rule, fled to Holland where Shaftesbury soon died.
Split into simpler sentences: With the "country party" in disarray, Lord Melville, David Leslie-Melville, 3rd Earl of Leven? Lord Leven and even Lord Shaftesbury, leader of the opposition to Charles's rule, fled to Holland where Shaftesbury soon died.