Original: Oliver Cromwell ( born April 25 , 1599 Old Style , died September 3 , 1658 Old Style ) was an English military and political leader best known for his involvement in making England into a republican Commonwealth and for his later role as Lord Protector of England , Scotland , and Ireland .
Simplified: Oliver Cromwell ( April 25 1599 -- September 3 1658 ) was an English military and political leader best known for making England a republic and leading the Commonwealth of England .