Complex sentence: He marched north and arrived in York during the summer of 1068, the opposition melted away with some of them, including Edgar, taking refuge at the court of the Scottish king Malcolm III. Stenton.
Split into simpler sentences: He marched north and arrived in York during the summer of 1068. The opposition melted away, with some of them--including Edgar--taking refuge at the court of the Scottish king Malcolm III. Stenton.