Complex sentence: In May of 1567 Queen Mary of Scotland married James Hepburn, 4th Earl of Bothwell many of the Queen's allies who previously supported her including Maitland, Morton, Balfour, and Murray of Tullibardine disapproved of this and chose to oppose her.
Split into simpler sentences: In May of 1567 Queen Mary of Scotland married James Hepburn, 4th Earl of Bothwell. Many of the Queen's allies who previously supported her including Maitland, Morton, Balfour, and Murray of Tullibardine disapproved of this and chose to oppose her.