Complex sentence: Archibald Campbell, 5th Earl of Argyll (1532/1537--12 September 1573) was one of the leading figures in the politics of Scotland during the reign of Mary, Queen of Scots, and the early part of that of James VI.
Split into simpler sentences: Archibald Campbell, 5th Earl of Argyll (1532/1537--12 September 1573) was a Scottish nobleman, peer, and politician. He was one of the leading figures in the politics of Scotland during the reign of Mary, Queen of Scots, and the early part of that of James VI.