Complex sentence: Franz Freiherr von Mercy (or Merci), lord of Mandre and Collenburg (died 1645), German general in the Thirty Years' War, who came of a noble family of Lorraine, was born at Longwy some time between 1590 and 1598.
Split into simpler sentences: Franz Freiherr von Mercy (or Merci), Lord of Mandre and Collenburg (died 1645), was a German general in the Thirty Years' War. Franz von Mercy who came of a noble family of Lorraine, was born at Longwy some time between 1590 and 1598.