Complex sentence: John Knox (c.1513--24 November 1572) was a Scottish minister, theologian, and writer who was a leader of the Reformation and is considered the founder of the Presbyterian Church of Scotland.
Split into simpler sentences: John Knox (c.1513--24 November 1572) was a Scottish minister, theologian, and writer who was a leader of the Reformation. He is the founder of the Presbyterian Church of Scotland.