Last month's agreement between the European Union and the United Kingdom to move the official date of Brexit to Oct. 31 has somewhat reduced the sense of urgency connected to the United Kingdom's departure from the Continental bloc. But while delaying Brexit has bought British politicians some time, it has not eliminated the divisions within Prime Minister Theresa May's government, reduced the fragmentation in the House of Commons or eliminated long-term questions about the final shape of the Brexit deal. Indeed, the coming weeks and months will be plenty full of Brexit drama....